stylistic:tone
19th century

During the nineteenth century, each of the states maintained its militia differently, some more than others. American militia saw action in the various Indian Wars, the War of 1812, the American Civil War, and the Spanish–American War. Sometimes militia units were found to be unprepared, ill-supplied, and unwilling. Prior to the Civil War, militia units were sometimes used by southern states for slave control. Formed in 1860, Republican Party-affiliated Wide Awakes clubs were quick to take action to defend persons against southern slave-hunters. In California, the militia carried out campaigns against bandits and against the Indians at the direction of its Governor between 1850 and 1866. During Reconstruction after the Civil War, Republican state governments had militias composed almost entirely of freed slaves and populist whites. Their deployment to maintain order in the former Confederate states caused increased resentment among many Southern whites.

After the American Civil War, secret groups like the Ku Klux Klan and Knights of the White Camellia arose quickly across the South, reaching a peak in the late 1860s. Even more significant in terms of effect were private militias: paramilitary organizations that formed starting in 1874, including the White League in Louisiana, which quickly formed chapters in other states; the Red Shirts in Mississippi in 1875, and with force in South Carolina and North Carolina; and other "white line" militias and rifle clubs.

In contrast to the KKK, these paramilitary organizations were open; members were often well known in their communities. Nevertheless, they used force, intimidation, and violence, including murder, to push out Republican officeholders, break up organizing, and suppress freedmen 's voting and civil rights. The paramilitary groups were described as "the military arm of the Democratic Party " and were instrumental in helping secure Democratic victories in the South in the elections of 1876.