apr 12, 1861 - Battle of Fort Sumter
Description:
The Battle of Fort Sumter marks the beginning of the Civil War. Fort Sumter, a Union-controlled fort, was located in South Carolina, which at the time had recently seceded. The battle began when a confederate general attacked the fort after President Lincoln announced his plans to resupply the fort.
Sources:
https://www.history.com/topics/american-civil-war/fort-sumter
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