"With secession, several federal forts, including Fort Sumter in South Carolina, suddenly became outposts in a foreign land. Abraham Lincoln made the decision to send fresh supplies to the beleaguered garrisons.
On April 12, 1861, Confederate warships turned back the supply convoy to Fort Sumter and opened a 34-hour bombardment on the stronghold. The garrison surrendered on April 14.
The Civil War was now underway. On April 15, Lincoln called for 75,000 volunteers to join the Northern army. Unwilling to contribute troops, Virginia, Arkansas, North Carolina, and Tennessee dissolved their ties to the federal government."