Conversation so far:
who started the civil war in the united states
War broke out in April 1861 when secessionist forces attacked Fort Sumter in South Carolina shortly after Abraham Lincoln had been inaugurated as the President of the United States.
how long was the civil war in the united states
The American Civil War was a civil war in the United States from 1861 to 1865.

Question: how did the war end
Self-contained rewrite: how did the american civil war end