In the spring of 1861, tensions between the northern and southern United States exploded into the American Civil War (1861-65). The election of the anti-slavery Republican Abraham Lincoln as president in 1860 caused seven southern states to secede from the Union to form the Confederate States of America; four more joined them after the first shots of the Civil War were fired.
Seven future U.S. presidents served in the Civil War: Ulysses S. Grant, Rutherford B. Hayes, William McKinley, James Garfield, Benjamin Harrison, Chester A. Arthur, and Andrew Johnson
In a single day, the 1 million Civil War horses would have peed enough urine to fill more than 12 standard swimming pools.
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