U.S. Civil WarFort SumterAmerican history
On April 12, 1861, the U.S. Civil War began, marking a pivotal moment in American history with Confederate forces attacking Fort Sumter in South Carolina.

The article covers significant historical events on April 12, including the beginning of the U.S. Civil War, Franklin D. Roosevelt's death in 1945, the declaration of the Salk vaccine against polio in 1955, Yuri Gagarin's space flight in 1961, and other notable occurrences across various years.