Answer:
Because of the possible secession of Virginia and other loyal states.
Explanation:
Fort Sumter is one of the most famous sites of the Civil War because US Major Robert Anderson occupied the fort following the secession of South Carolina from the Union and initiated the state militia’s forces. Lincoln resisted on sending more troops to the location because there was a possibility that Virginia and other loyal states would also secede. Later, those states seceded as well and joined the Confederacy.