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The American Civil War (1861–1865), also referred to as the War Between the States or simply the Civil War, was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ("the Confederacy"); the other 25 states supported the federal government ("the Union"). After four years of warfare, mostly within the Southern states, the Confederacy surrendered and slavery was outlawed everywhere in the nation. Issues that led to war were partially resolved in the Reconstruction Era that followed, though others remained unresolved.
Commanders and leaders
Also see: Notables of the American Civil War.
United States
- Abraham Lincoln
- Winfield Scott
- George B. McClellan
- Henry Wager Halleck
- Ulysses S. Grant
- Gideon Welles
Confederate States
Regiments by state
United States
Federal organized
- United States Colored Troops
- United States Regular Army
- United States Volunteers
State forces
- Alabama (Union)
- Arkansas (Union)
- California
- Colorado
- Connecticut
- Delaware
- Georgia (Union)
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana (Union)
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Missouri
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New York
- North Carolina (Union)
- Ohio
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina (Union)
- Tennessee (Union)
- Vermont
- West Virginia
- Wisconsin
Territories
- Dakota Territory
- New Mexico Territory
- Washington Territory
Confederate States
Federal organized
State forces
- Alabama
- Arkansas
- California (Confederate)
- Florida
- Georgia
- Kentucky
- Louisiana
- Maryland (Confederate)
- Mississippi
- Missouri
- North Carolina
- South Carolina
- Tennessee
- Texas
- Virginia
- West Virginia (Confederate)
Territories
- Arizona Territory
- Indian Territory (also known as Oklahoma)