Answer:
Political Parties Splinter
The Election of 1860
Southern States Secede
Efforts at Compromise Fail
First Shots at Fort Sumter
Lincoln Calls out the Militia
The war between the United States and the Confederate States began on April 12, 1861 at Fort Sumter, Charleston, South Carolina. The immediate cause was Constitutional principle: the U.S. government refused to recognize the southern states' right to secede from the Union, and the C.S.