American Civil War
Also known as: War Between the States · Civil War · The Civil War · U.S. Civil War · US Civil War · United States Civil War · War of the Rebellion · War of Northern Aggression
The American Civil War was a civil war in the United States between the Union and the Confederacy, which was formed in 1861 by states that had seceded from the Union to preserve slavery in the United States.
Connections3
Broader conflict containing the battle
The Battle of Antietam was a pivotal event within the larger American Civil War, serving as the bloodiest single-day battle of the entire conflict.
precursor to the formation of Buffalo Soldiers
The service of the United States Colored Troops during the Civil War provided the precedent and political momentum for creating permanent Black regiments.
Major expansion period for agency operations
The agency gained national prominence during the Civil War, notably providing intelligence services for the Union Army and protecting Abraham Lincoln.