The American Civil War was triggered by slavery. As the West opened up, a growing abolitionist movement in the North refused to allow the spread of slavery to new states like Kansas. When the mildly abolitionist Republican Party candidate Abraham Lincoln was elected President in 1860, 11 southern states, their economies largely dependent on cotton harvested by enslaved African Americans, seceded from the Union and formed a Confederacy.
Lincoln began the war without a large army. Many of its Southern-born officers put loyalty to their native states first and resigned their US commissions to serve the Confederacy.
Lincoln appealed for 75,000 volunteers to preserve the Union. But th
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