300
This war was fought from 1861-1865 between the northern and southern parts of the United States. President Lincoln wanted to abolish slavery and people in the south didn't agree, so they attempted to become an independent nation. Lincoln and others in the north didn't want the U.S. to split, so they waged war over it. The north won, meaning that the U.S. stayed one nation and slavery was abolished for good.
What is the American Civil War?