When did the US Civil War begin?

The US civil war began on April 12 1861 when the confederacy attacked union troops stationed at Fort Sumter in South Carolina.
The events leading to the beginning of the US Civil War began on April 12, 1861. Confederate forces bombarded US Fort Sumter in the Charleston Harbor, South Carolina. The fort was forced to surrender. President Lincoln then called for 75,000 volunteers to end the Southern Rebellion. The US Supreme Court ruled that the conflict officially began in July 1861 when Lincoln called the US Congress together to authorize funds and supplies to end the rebellion. For the South the war began in May of 1861, when the Confederate congress recognized that a state of war existed between the Confederate States of America and the United States.