Reform War — 1858–1861 internal conflict in Mexico

Bombardment of Fort Sumter, immediate cause and first battle of the American Civil War

Part of the American Civil War in New Mexico Territory (1861)

1861 battle of the Trans-Mississippi Theater of the American Civil War

Battle between Sioux and Crow

Emancipation reform of 1861 — reform passed by Tsar Alexander II of Russia which effectively abolished serfdom throughout the Russian Empire

1861 treaty between the United States and representatives of the Cheyenne and Arapaho

1861 civil riot against Union troops during the American Civil War

Battle in the American civil war

1861 early battle of the American Civil War

1861 early battle of the American Civil War