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What are the most important events that led up to the American Civil War?
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The most important events leading up to the American Civil War were the election of Abraham Lincoln in 1860, the secession of several southern states in 1861, and the attack on Fort Sumter in 1861. These events set off a chain reaction of political, economic, social, and military developments that eventually resulted in the outbreak of war between the Union and the Confederacy.