Who was in the civil war?

The American Civil War (1861-1865) primarily involved the Northern states, known as the Union, and the Southern states that seceded from the Union to form the Confederacy. Key figures included President Abraham Lincoln for the Union and Confederate President Jefferson Davis. The war was fought over issues such as states' rights and slavery, leading to significant social and political change in the United States. Ultimately, the Union's victory preserved the nation and led to the abolition of slavery.