The “significant outcome of Fort Sumter” is that the battle there marked the beginning of the American Civil War.
Fort Sumter was a fort on an island in the harbor of Charleston, South Carolina. It was manned by the armed forces of the United States. In late 1860, the state of South Carolina seceded from the Union. South Carolina believed that the US forces should evacuate and the fort should be part of South Carolina. James Buchanan, then president of the US, declined to evacuate the fort and tried to reinforce it, only for the attempt to be repulsed. In April of 1861, Abraham Lincoln was president and he sent a larger fleet to try to supply the fort. This led the Confederate forces to bombard the fort. After a long bombardment, the fort’s defenders were forced to surrender. This battle was important because it was the beginning of the Civil War.