The Civil War was a conflict in the United States from 1861 to 1865, primarily fought between the Northern states (the Union) and the Southern states that seceded to form the Confederacy. The war was largely centered around issues such as slavery, states' rights, and economic differences. The Union, led by President Abraham Lincoln, aimed to preserve the nation and abolish slavery, while the Confederacy, led by President Jefferson Davis, sought to maintain their independence and the institution of slavery. The war resulted in significant loss of life and ultimately led to the defeat of the Confederacy and the end of slavery in the United States.