Early-mid Colonial era (1607–1754)

First muster, spring 1637, Massachusetts Bay Colony

The early colonists of America considered the militia an important social institution, necessary to provide defense and public safety.^[17]

On August 29, 1643, the Plymouth Colony Court allowed and established a military discipline to be erected and maintained.^[18]

French and Indian War (1754–1763)

Braddock's defeat, 1755

During the French and Indian Wars, town militia formed a recruiting pool for the Provincial Forces. The legislature of the colony would authorize a certain force level for the season's campaign and set recruitment quotas for each local militia. In theory, militia members could be drafted by lot if there were inadequate forces for the Provincial Regulars; however, the draft was rarely resorted to because provincial regulars were highly paid (more highly paid than their regular British Army counterparts) and rarely engaged in combat.

In September 1755, George Washington, then adjutant-general of the Virginia militia, upon a frustrating and futile attempt to call up the militia to respond to a frontier Indian attack:^[19]

... he experienced all the evils of insubordination among the troops, perverseness in the militia, inactivity in the officers, disregard of orders, and reluctance in the civil authorities to render a proper support. And what added to his mortification was, that the laws gave him no power to correct these evils, either by enforcing discipline, or compelling the indolent and refractory to their duty ... The militia system was suited for only to times of peace. It provided for calling out men to repel invasion; but the powers granted for effecting it were so limited, as to be almost inoperative.^[19]

See New Hampshire Provincial Regiment for a history of a Provincial unit during the French and Indian War.

Pre-American Revolutionary War era (1763–1775)

Just prior to the American Revolutionary War, on October 26, 1774, the Massachusetts Provincial Congress, observing the British military buildup, deemed their militia resources to be insufficient: the troop strength, "including the sick and absent, amounted to about seventeen thousand men ... this was far short of the number wanted, that the council recommended an immediate application to the New England governments to make up the deficiency":^[20]

... they recommended to the militia to form themselves into companies of minute-men, who should be equipped and prepared to march at the shortest notice. These minute-men were to consist of one quarter of the whole militia, to be enlisted under the direction of the field-officers, and divide into companies, consisting of at least fifty men each. The privates were to choose their captains and subalterns, and these officers were to form the companies into battalions, and chose the field-officers to command the same. Hence the minute-men became a body distinct from the rest of the militia, and, by being more devoted to military exercises, they acquired skill in the use of arms. More attention than formerly was likewise bestowed on the training and drilling of militia.^[20]

American Revolutionary War (1775–1783)

The Battle of Lexington, April 19th, 1775. Blue coated militiamen in the foreground flee from the volley of gunshots from the red coated British Army line in the background with dead and wounded militiamen on the ground.

The American Revolutionary War began near Boston, Massachusetts with the Battles of Lexington and Concord, in which a group of local militias constituted the American side (the "Patriots"). On April 19, 1775, a British force 800 strong marched out of Boston to Concord intending to destroy patriot arms and ammunition. At 5:00 in the morning at Lexington, they met about 70 armed militiamen whom they ordered to disperse, but the militiamen refused. Firing ensued; it is not clear which side opened fire. This became known as "the shot heard round the world". Eight militiamen were killed and ten wounded, whereupon the remainder took flight. The British continued on to Concord and were unable to find most of the arms and ammunition of the patriots. As the British marched back toward Boston, patriot militiamen assembled along the route, taking cover behind stone walls, and sniped at the British. At Meriam's Corner in Concord, the British columns had to close in to cross a narrow bridge, exposing themselves to concentrated, deadly fire. The British retreat became a rout. It was only with the help of an additional detachment of 900 troops that the British force managed to return to Boston.^[21] This marked the beginning of the war. It was "three days after the affair of Lexington and Concord that any movement was made towards embodying a regular army".^[22]

In 1777, the Second Continental Congress adopted the Articles of Confederation, which contained a provision for raising a confederal militia that consent would be required from nine of the 13 States. Article VI of the Articles of Confederation states,

... every State shall always keep up a well-regulated and disciplined militia, sufficiently armed and accoutered, and shall provide and constantly have ready for use, in public stores, a due number of field pieces and tents, and a proper quantity of arms, ammunition and camp equipage.

Some militia units appeared without adequate arms, as evidenced in this letter from John Adams to his wife, dated August 26, 1777:

The militia are turning out with great alacrity both in Maryland and Pennsylvania. They are distressed for want of arms. Many have none, we shall rake and scrape enough to do Howe's business, by favor of the Heaven.^[23]

The initial enthusiasm of Patriot militiamen in the beginning days of the war soon waned. The historian Garry Wills explains,

The fervor of the early days in the reorganized militias wore off in the long grind of an eight-year war. Now the right to elect their own officers was used to demand that the men not serve away from their state. Men evaded service, bought substitutes to go for them as in the old days, and had to be bribed with higher and higher bounties to join the effort – which is why Jefferson and Samuel Adams called them so expensive. As wartime inflation devalued the currency, other pledges had to be offered, including land grants and the promise of "a healthy slave" at the end of the war. Some men would take a bounty and not show up. Or they would show up for a while, desert, and then, when they felt the need for another bounty, sign up again in a different place. ... This practice was common enough to have its own technical term – "bounty jumping".^[24]

The burden of waging war passed to a large extent to the standing army, the Continental Army. The stay-at-home militia tended then to perform the role of the internal police to keep order. British forces sought to disrupt American communities by instigating slave rebellions and Indian raids. The militia fended off these threats. Militias also spied on Loyalists in the American communities. In Albany County, New York, the militia established a Committee for Detecting and Defeating Conspiracies to look out for and investigate people with suspicious allegiances.^[25]

Confederation period (1783–1787)

Politically, the militia was highly popular during the postwar period, though to some extent, based more on pride of victory in the recent war than on the realities.^[26] This skepticism of the actual value of relying upon the militia for national defense, versus a trained regular army was expressed by Gouverneur Morris:

An overweening vanity leads the fond many, each man against the conviction of his own heart, to believe or affect to believe, that militia can beat veteran troops in the open field and even play of battle. This idle notion, fed by vaunting demagogues, alarmed us for our country, when in the course of that time and chance, which happen to all, she should be at war with a great power.^[27]

Robert Spitzer, citing Daniel Boorstin, describes this political dichotomy of the public popularity of the militia versus the military value:^[26]

While the reliance upon militias was politically satisfying, it proved to be an administrative and military nightmare. State detachments could not be easily combined into larger fighting units; soldiers could not be relied on to serve for extended periods, and desertions were common; officers were elected, based on popularity rather than experience or training; discipline and uniformity were almost nonexistent.

General George Washington defended the militia in public, but in correspondence with Congress expressed his opinion of the militia quite to the contrary:

To place any dependence on the Militia, is, assuredly, resting upon a broken staff. Men just dragged from the tender Scenes of domestic life; unaccustomed to the din of Arms; totally unacquainted with every kind of military skill, which being followed by a want of confidence in themselves, when opposed to Troops regularly trained, disciplined, and appointed, superior in knowledge and superior in Arms, makes them timid, and ready to fly from their own shadows ... if I was called upon to declare upon Oath, whether the Militia have been most serviceable or hurtful upon the whole, I should subscribe to the latter.^[28]

At the end of the Revolutionary War, a political atmosphere developed at the local level where the militia was seen with fondness, despite their spotty record on the battlefield. Typically, when the militia did act well was when the battle came into the locale of the militia, and local inhabitants tended to exaggerate the performance of the local militia versus the performance of the Continental Army. The Continental Army was seen as the protector of the States, though it also was viewed as a dominating force over the local communities. Joseph Reed, president of Pennsylvania viewed this jealousy between the militia forces and the standing army as similar to the prior frictions between the militia and the British Regular Army a generation before during the French and Indian War. Tensions came to a head at the end of the war when the Continental Army officers demanded pensions and set up the Society of the Cincinnati to honor their own wartime deeds. The local communities did not want to pay national taxes to cover the Army pensions, when the local militiamen received none.^[29]

Constitution and Bill of Rights (1787–1789)

The delegates of the Constitutional Convention (the Founding Fathers/Framers of the U.S. Constitution) under Article 1; section 8, clauses 15 and 16 of the federal constitution, granted Congress the power to "provide for organizing, arming, and disciplining the Militia", as well as, and in distinction to, the power to raise an army and a navy. The U.S. Congress is granted the power to use the militia of the U.S. for three specific missions, as described in Article 1, section 8, clause 15: "To provide for the calling of the militia to execute the laws of the Union, suppress insurrections, and repel invasions." The Militia Act of 1792^[30] clarified whom the militia consists of:

Be it enacted by the Senate and House of Representatives of the United States of America, in Congress assembled, That each and every free able-bodied white male citizen of the respective States, resident therein, who is or shall be of age of eighteen years, and under the age of forty-five years (except as is herein after excepted) shall severally and respectively be enrolled in the militia, by the Captain or Commanding Officer of the company, within whose bounds such citizen shall reside, and that within twelve months after the passing of this Act.

Federalist period (1789–1801)

In 1794, a militia numbering approximately 13,000 was raised and personally led by President George Washington to quell the Whiskey Rebellion in Pennsylvania. From this experience, a major weakness of a States-based citizen militia system was found to be the lack of systematic army organization, and a lack of training for engineers and officers. George Washington repeatedly warned of these shortcomings up until his death in 1799. Two days before his death, in a letter to General Alexander Hamilton, George Washington wrote: "The establishment of a Military Academy upon a respectable and extensive basis has ever been considered by me as an object of primary importance to this country; and while I was in the chair of government, I omitted no proper opportunity of recommending it in my public speeches, and otherwise to the attention of the legislature."^[34]

Early republic (1801–1812)

In 1802, the federal military academy at West Point was established, in part to rectify the failings of irregular training inherent in a States-based militia system.^[34]

War of 1812 (1812–1815)

Kentucky Mounted Militia riflemen at the Battle of the Thames in October 1813, riding into battle as mounted infantry.

In the War of 1812, the United States Militia were at times routed if they fought conventionally on the battle in the open as they were undisciplined, untrained, and underfunded. For example, at the Battle of Bladensburg, the militia were set up in linear formation with little to no entrenchments and very little help from the Regular Army. Thus the Militia were routed easily and fled from the battlefield in large numbers, allowing the smaller British force to successfully raid and destroy the White House in Washington D.C.^[35]

American militias were very effective when fighting in unconventional guerrilla warfare such as the defense of Hampton Village on June 25, 1813, where American militia conducted a few devastating ambushes, conducted harassing fire behind cover, and fought some hit-and-run engagements. Although the militia were routed and withdrew with 7 killed, 12 wounded, and 12 missing, the British suffered 120 killed and at least 95 wounded.^[36][37] American militia as horse-mounted raiders were very effective at conducting incursions or raids into British Canada. For instance, Duncan McArthur led a successful mounted raid into Canada with an almost entirely militia force.^[38] William Henry Harrison led an incursion into Thames with an almost entirely Kentucky mounted militia force which captured an entire British army, eliminated Tecumseh, and suffered very few casualties.^[39]

Militias fared better and proved more reliable when protected behind defensive entrenchments and fixed fortifications, using guerrilla tactics such as firing from behind cover, being reinforced with Regular armed forces, or a little bit of all those factors. In the Battle of Plattsburgh, the American militia dug entrenchments, fixed fortifications, disguised the roads with camouflage, and felled trees across the road. The Regulars and militia harassed the British army by firing at them from behind stone fences, trees, and whatever cover they could find before retreating to their entrenched fortified defense. As the British lost the naval engagement of the Plattsburgh battle, they continued to face heavy fire from the militia. Facing increased casualties, the British withdrew, making the Americans the victors.^[40]

The American militia failed if they were poorly led, had bad logistics, were not trained properly or were misused. But they could be a potent force if there was a good competent leader, better logistics, used carefully, better trained, or a combination of all those factors. However, the U.S. government still believed militia were inadequate, and the desire for a professional regular army prevailed. Military budgets were greatly increased at this time and a smaller, standing federal army, rather than States' militias, was deemed better for the national defense.^[41]

Antebellum era (1815–1861)

By the 1830s, the American frontier expanded westwards, with the Indian Wars in the eastern U.S. ending. Many states let their unorganized militia lapse in favor of volunteer militia units such as city guards who carried on in functions such as assisting local law enforcement, providing troops for ceremonies and parades or as a social club. The groups of company size were usually uniformed and armed through their own contributions. Volunteer units of sufficient size could elect their own officers and apply for a state charter under names that they themselves chose.^[42]

1826 North Carolina militia roster of 86 men, standard wage of 46+1⁄2 cents per day. Text reads: "A List of that Part of the Millitia Commanded by Elisha Burk an went after the Runaway Negroes. ... The within is a True Return of that part of the Millitia Commanded by Elisha Burk While out after the Runaway Negroes: Given under my hand this 15th day of August 1826". (signed) Elisha Burk Captain.

The states' militia continued service, notably, in the slave-holding states, to maintain public order by performing slave patrols to round up fugitive slaves.^[43] A Mississippi town history described their militia of the 1840s: "The company musters of the citizen soldiers were held four times a year...After a brief parade, which consisted in a blundering execution of unwarlike antics, these men would start drinking and usually several fights occurred."^[44]

Responding to criticisms of failures of the militia, Adjutant General William Sumner wrote an analysis and rebuttal in a letter to John Adams, May 3, 1823:

The disasters of the militia may be ascribed chiefly, to two causes, of which the failure to train the men is a principle one; but, the omission to train the officers is as so much greater, that I think the history of its conduct, where it has been unfortunate, will prove that its defects are attributable, more to their want of knowledge or the best mode of applying the force under their authority to their attainment of their object than to all others. It may almost be stated, as an axiom, that the larger the body of undisciplined men is, the less is its chance of success; ...^[45]

During this inter-war period of the nineteenth century, the states' militia tended towards being disorderly and unprepared.

The demoralizing influences even of our own militia drills has long been notorious to a proverb. It has been a source of general corruptions to the community, and formed habits of idleness, dissipation and profligacy ... musterfields have generally been scenes or occasions of gambling, licentiousness, and almost every vice. ... An eye-witness of a New England training, so late as 1845, says, "beastly drunkenness, and other immoralities, were enough to make good men shudder at the very name of a muster".^[46]

Joseph Story lamented in 1842 how the militia had fallen into serious decline:

And yet, though this truth would seem so clear, and the importance of a well regulated militia would seem so undeniable, it cannot be disguised, that among the American people there is a growing indifference to any system of militia discipline, and a strong disposition, from a sense of its burdens, to be rid of all regulations. How it is practicable to keep the people duly armed without some organization, it is difficult to see. There is certainly no small danger, that indifference may lead to disgust, and disgust to contempt; and thus gradually undermine all the protection intended by this clause of our National Bill of Rights.^[47]

Due to rising tensions between Latter-day Saints and their Missourian neighbors, in 1838, General David R. Atchison, the commander of the state militia of Northwestern Missouri, ordered Samuel Bogart to "prevent, if possible, any invasion of Ray County by persons in arms whatever".^[48] Bogart, who had participated in former anti-Mormon vigilante groups, proceeded to disarm resident Latter-day Saints and forced them to leave the county. In response David W. Patten led the Caldwell County militia to rescue Latter-day Saint residents from what they believed was a "mob". The confrontation between these two county militias (Ray and Caldwell) became known as the Battle of Crooked River and is a primary cause for Governor Lilburn Boggs issuing Missouri Executive Order 44. This order, often called the "Extermination Order", told the commander of the Missouri State Militia, General John Bullock Clark, that, "The Mormons must be treated as enemies, and must be exterminated or driven from the state if necessary for the public pease—their outrages are beyond description."^[49] In the following days, Missouri militia killed 17 Latter-day Saints at Haun's Mill, laid siege to Far West, Missouri and jailed Latter-day Saint church leaders, including Joseph Smith.^[50]

The Mormon militia, in 1857 and 1858, fought against U.S. federal troops in the Utah War over control of government territory.

During the violent political confrontations in the Kansas Territory involving anti-slavery Free-Staters and pro-slavery "Border Ruffians" elements, the militia was called out to enforce order on several occasions,^[51] notably during the incidents referred to as the Wakarusa War.

During John Brown's raid on Harpers Ferry, local militia companies from villages within a 30-mile radius of Harpers Ferry cut off Brown's escape routes and trapped Brown's men in the armory.^[52]

American Civil War

At the beginning of the American Civil War, neither the North or the South was nearly well enough prepared for war, and few people imagined the demands and hardships the war would bring. Just prior to the war the total peacetime army consisted of a paltry 16,000 men. Both sides issued an immediate call to forces from the militia, followed by the immediate awareness of an acute shortage of weapons, uniforms, and trained officers. State militia regiments were of uneven quality, and none had anything resembling combat training. The typical militia drilling at the time amounted to, at best, parade-ground marching. The militia units, from local communities, had never drilled together as a larger regiment, and thus lacked the extremely important skill, critically necessary for the war style of the time, of maneuvering from a marching line into a fighting line. Yet both sides were equally unready, and rushed to prepare.^[53]

Union militia

New York state militia, Civil War
Company "E", 22nd N.Y. State Militia, near Harpers Ferry.

Following U.S. refusal to remove its militaries from newly independent republic of South Carolina, resulting in the Battle of Fort Sumter and beginning of the Civil War, President Lincoln called up 75,000 state militiamen to retake the former U.S. federal fort and found that the militia "strength was far short of what the Congressional statute provided and required".^[54]

In the summer of 1861, military camps circled around Washington, D.C. composed of new three-year army volunteers and 90-day militia units. The generals in charge of this gathering had never handled large bodies of men before, and the men were simply inexperienced civilians with arms having little discipline and less understanding of the importance of discipline.^[55]

In the West, Union state and territorial militias existed as active forces in defense of settlers there. California especially had many active militia companies at the beginning of the war that rose in number until the end of the war. It provided the most volunteers from west of the Rocky Mountains: eight regiments and two battalions of infantry, two regiments and a battalion of cavalry. It also provided most of the men for the infantry regiment from Washington Territory. Oregon raised an infantry and a cavalry regiment. Colorado Territory militias were organized to resist both the Confederacy and any civil disorder caused by secessionists, Copperheads, Mormons, or most particularly the native tribes.

The Colorado Volunteers participated in the Battle of Glorieta Pass, turning back a Confederate invasion of New Mexico Territory. Later they initiated the Colorado War with the Plains Indians and committed the Sand Creek massacre. The California Volunteers of the California Column were sent east across the southern deserts to drive the Confederates out of southern Arizona, New Mexico, and west Texas around El Paso, then fought the Navajo and Apache until 1866. They also were sent to guard the Overland Trail, keep the Mormons under observation by the establishment of Fort Douglas in Salt Lake City, and fought a campaign against the Shoshone culminating in the Battle of Bear River.

In Nevada, Oregon and Idaho Territory, California, Oregon and Washington Territorial Volunteers tried to protect the settlers and pacified tribes, fighting the Goshute, Paiute, Ute and hostile Snake Indians in the Snake War from 1864 until 1866. In California, volunteer forces fought the Bald Hills War in the northwestern forests until 1864 and also the Owens Valley Indian War in 1862–1863.

Reconstruction era

With passage of federal reconstruction laws between 1866 and 1870 the U.S. Army took control of the former rebel states and ordered elections to be held. These elections were the first in which African Americans could vote. Each state (except Virginia) elected Republican governments, which organized militia units.^[56] The majority of militiamen were black.^[57] Racial tension and conflict, sometimes intense, existed between the Negro freedmen and the ex-Confederate whites.

In parts of the South, white paramilitary groups and rifle clubs formed to counter this black militia, despite the laws prohibiting drilling, organizing, or parading except for duly authorized militia. In Reconstruction Louisiana, the Knights of the White Camelia, the Ku Klux Klan, Swamp Fox Rangers, and a couple other paramilitary groups sought to counter official governments.^[58] These groups engaged in a prolonged series of retaliatory, vengeful, and hostile acts against this black militia.^[59]

... the militia companies were composed almost entirely of Negroes and their marching and counter-marching through the country drove the white people to frenzy. Even a cool-headed man like General George advised the Democrats to form military organizations that should be able to maintain a front against the negro militia. Many indications pointed to trouble. A hardware merchant of Vicksburg reported that with the exceptions of the first year of the war his trade had never been so brisk. It was said that 10,000 Spencer rifles had been brought into the State.^[60]

The activity of the official black militia, and the unofficial illegal white rifle clubs, typically peaked in the autumn surrounding elections. This was the case in the race riot of Clinton, Mississippi in September 1875, and the following month in Jackson, Mississippi. An eyewitness account:

I found the town in great excitement; un-uniformed militia were parading the streets, both white and colored. I found that the white people—democrats—were very much excited in consequence of the governor organizing the militia force of the state. ... I found that these people were determined to resist his marching the militia (to Clinton) with arms, and they threatened to kill his militiamen.^[61]

Outright war between the state militia and the white rifle clubs was avoided only by the complete surrender of one of the belligerents, though tensions escalated in the following months leading to a December riot in Vicksburg, Mississippi resulting in the deaths of two whites and thirty-five black people. Reaction to this riot was mixed, with the local Democrats upset at the influx of federal troops that followed, and the Northern press expressing outrage: "Once more, as always, it is the Negroes that are slaughtered while the whites escape."^[62]

Great Railroad Strike of 1877

The Great Railroad Strike of 1877, beginning in July 1877 in Martinsburg, West Virginia and spreading to 15 other states across the Midwest, was the first national labor strike in United States history. West Virginia Governor Henry M. Mathews was the first state commander-in-chief to call up militia units to suppress the strike, and this action has been viewed in retrospect as an action that would transform the National Guard by revealing the shortcomings of the state militias. In all, approximately 45,000 militiamen were called out nationwide.^[63]

Posse Comitatus Act

In 1878, Congress passed the Posse Comitatus Act intended to prohibit federal troops and federal-controlled militia from supervising elections. This act substantially limits the powers of the Federal government to use the military serving on active duty under Title 10 for law enforcement, but does not preclude governors from using their National Guard in a law enforcement role as long as the guardsmen are serving under Title 32 or on state active duty.

Spanish–American War

Despite a lack of initial readiness, training, and supplies, the militias of the United States fought and achieved victory in the Spanish–American War.^[64]

Ludlow massacre

Militia at Ludlow, 1914

In 1914, in Ludlow, Colorado, the militia was called out to calm the situation during a coal mine strike, but the sympathies of the militia leaders allied with company management and resulted in the deaths of roughly 19 to 25 people.

The state National Guard was originally called out, but the company was allowed to organize an additional private militia consisting of Colorado Fuel & Iron Company (CF&I) guards in National Guard uniforms augmented by non-uniformed mine guards.

The Ludlow massacre was an attack by the Colorado National Guard and Colorado Fuel & Iron Company camp guards on a tent colony of 1,200 striking coal miners and their families at Ludlow, Colorado on April 20, 1914.

In retaliation for Ludlow, the miners armed themselves and attacked dozens of mines over the next ten days, destroying property and engaging in several skirmishes with the Colorado National Guard along a 40-mile front from Trinidad to Walsenburg. The entire strike cost between 69 and 199 lives. Thomas Franklin Andrews described it as the "deadliest strike in the history of the United States".

Mexican Revolution

American organized and unorganized militias fought in the Mexican Revolution. Some campaigned in Mexico as insurgent forces and others fought in battles such as Ambos Nogales and Columbus in defense of the interests of United States.

World War I

1. The Plattsburg Movement Preparedness Movement. The Hays Law.^[65]

Organized militia

Each state and most territories have two mandatory forces, namely the Army National Guard and the Air National Guard. Many states also have state defense forces and a naval militia, which assist, support and augment National Guard forces.

Unorganized militia

All able-bodied men 17 to 45 of age who are not part of the organized militia are known as the unorganized militia (10 USC). Able-bodied men who are not eligible for inclusion in the reserve militia pool are those aliens not having declared their intent to become citizens of the United States (10 USC 246) and former regular component veterans of the armed forces who have reached the age of 64 (32 USC 313). All female citizens who are members of National Guard units are also included in the reserve militia pool (10 U.S.C. § 246).

Other persons who are exempt from call to duty (10 U.S.C. § 247) and are not therefore in the reserve militia pool include:

• The Vice President (also constitutionally the President of the Senate, that body which confirms the appointment of senior armed forces officers made by the Commander in Chief).
• The judicial and executive officers of the United States, the several States and Territories, and Puerto Rico.
• Members of the armed forces, except members who are not on active duty.
• Customhouse clerks.
• Persons employed by the United States in the transmission of mail.
• Workmen employed in armories, arsenals, and naval shipyards of the United States.
• Pilots on navigable waters.
• Mariners in the sea service of a citizen of, or a merchant in, the United States.

Many individual states have additional statutes describing their residents as part of the state militia; for example Washington law specifies all able-bodied citizens or intended citizens over the age of eighteen as members of the state militia, as explicitly distinct from the National Guard and Washington State Guard.^[74] In states such as Texas, the state constitution classifies male citizens between the ages of 17 and 45 to belong to the "Unorganized Reserve Militia".^[75] The Texas constitution also grants county sheriffs and the state governor the authority to call upon the unorganized reserve militia to uphold the peace, repel invasion, and suppress rebellion, similar to the early "Texas Rangers".

Private militias and the modern citizen-militia movement

Laws authorizing the state governments to officially make privately organized militias part of the state's official military force vary; Nevada, for example, allows the governor to "issue licenses to bodies of persons to organize, drill and bear arms as volunteer military companies or volunteer military organizations,"^[76] whereas South Carolina prohibits any group from being enlisted into its state guard.^[77] States with military histories that date back to the American Revolution may officially recognize militias from that era that continue to exist and operate independently; Massachusetts law explicitly makes the National Lancers part of its organized militia and protects the right of the Ancient and Honorable Artillery Company of Massachusetts to exist and operate as a private organization,^[78][79] while Rhode Island recognizes a number of independent chartered militias as a separate part of its overall military force.^[80][81] During World War II, Hawaii authorized several private paramilitary militias to operate, including the Businessmen's Military Training Corps and the Hawaii Air Depot Volunteer Corps.^[82]

Since approximately 1992, there have been a number of state- and regional-level private organizations in the United States that call themselves militia or unorganized militia, some of which have been tied to domestic terrorism and extremist views, which operate without any official sanctioning or licensing by their state governments.^[83] The 2000s and 2010s also saw the formation of several national-level private militia organizations, the largest of which were the Oath Keepers and Three Percenters.^[84][85]

U.S. federal militia forces

• United States National Guard

U.S. states' militia forces

• State defense forces
  • Naval militia