In 1860, Lincoln, a member of the Republican Party, was elected into office.
The southern states were angry with Lincoln being president, and seceded from the United States. They demanded that all United States property in the southern states be turned over to them, including military forts.
Union soldiers were camped at fort Sumter, but did not have enough supplies to hold the fort for a long time
Lincoln decided to send supplies to fort Sumter despite the southern states saying they would see this as an act of aggression.
The union and confederate generals Anderson and Beauregard tried to negotiate about what to do at the fort, but could not reach an agreement
Fort Sumter is mine
Confederate soldiers headed for fort Sumter to capture it