What side controlled fort Sumter?

Answer 1

Sumter was an island garrison in Charleston Harbour, occupied by the US Army.

In the run-up to the war, after South Carolina had seceded, Lincoln declared that the US would hold this territory against the threat of Confederate attack from the mainland.

In the end, he had to evacuate the island, and in retaliation he appealed for volunteer troops for the Union army. The war was on - and Sumter was occupied by the Confederates for the next four years.