Answer:
LONG TERM: Conflict over slavery between the North and South is a long term cause of the Civil War … The American Civil War started due to the secession of Southern states who then went on to form a new federal government, the Confederate States of America. New territories in the future would be settled by popular sovereignty.
SHORT TERM: The firing on Fort Sumter is considered a short term cause of the Civil War because it brought our country straight into battle. The fighting at the fort took place in just two days. Within this time period, Lincoln decided to fight back against the Confederates. Lincoln's decision immediately began the Civil War.
i hope this helps.