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Abraham Lincoln, who had declared "Government cannot endure permanently half slave, half free..." is elected president, the first Republican, receiving 180 of 303 possible electoral votes and 40 percent of the popular vote.
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South Carolina secedes from the Union. Followed within two months by Mississippi, Florida, Alabama, Georgia, Louisiana and Texas.
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The Confederate States of America is formed with Jefferson Davis, a West Point graduate and former U.S. Army officer, as president.
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At 4:30 a.m. Confederates under Gen. Pierre Beauregard open fire with 50 cannons upon Fort Sumter in Charleston, South Carolina. The Civil War begins.
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President Lincoln issues a Proclamation calling for 75,000 militiamen, and summoning a special session of Congress for July 4.
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Preliminary Emancipation Proclamation freeing slaves issued by President Lincoln
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The U.S. Congress enacts a draft, affecting male citizens aged 20 to 45, but also exempts those who pay $300 or provide a substitute. "The blood of a poor man is as precious as that of the wealthy," poor Northerners complain.
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Democrats nominate George B. McClellan for president to run against Republican incumbent Abraham Lincoln.
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Gen. Robert E. Lee surrenders his Confederate Army to Gen. Ulysses S. Grant at the village of Appomattox Court House in Virginia. Grant allows Rebel officers to keep their sidearms and permits soldiers to keep horses and mules.
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The Thirteenth Amendment to the United States Constitution, passed by Congress on January 31, 1865, is finally ratified. Slavery is abolished.