Because it turned the slavery debate into an actual shooting war that lasted four years.
It was the beginning of the Civil War.
Fort Sumter
Major Robert Anderson, US Army, was in command of the Federal garrison at Fort Sumter.
The Geography of the US.
Gravity
The Confederate capture of Fort Sumter was important to the US Civil War because it was the event that led to the US Civil War.
Fort Sumter in Charleston Harbour. The Union garrison evacuated the fort, and Lincoln called for new volunteer troops. This was the equivalent of declaring war. (There was, of course, no official declaration, since Congress did not recognise the Confederacy as a sovereign nation.) Fort Sumter, being the property of the US, was the first step to the US Civil War. Mr. Begg is correct that it was aftert Fort Sumter that the US Civil War began.
The Federal fort, Fort Sumter was located in the Charleston harbor in South Carolina. Southern forces attacked Fort Sumter, and the commander of the fort surrendered. This conflict led to US President Lincoln to ask for volunteers to serve for 3 months.
Fort Sumter.
Fort Sumter
The Head of Confederate Forces was Beauregard.Major Robert Anderson was the commander of the US garrison at Fort Sumter.
Fort Sumter is located on an island in the harbor of Charleston, SC.The US Civil War was triggered by a Confederate bombardment of the Union-occupied fort on April 12, 1861, and its subsequent surrender.