The Civil War started in April 1861, after several Southern states seceded, or broke away, from the United States. They formed the Confederate States of America (also known as the Confederacy). The Northern states were called the Union.
The biggest of the many issues that divided the country was slavery. At the time, nearly 4 million enslaved people lived in the U.S. They or their ancestors had been kidnapped from Africa. Enslaved people had no rights or freedoms. They were treated as property, not human beings. They were bought and sold by White enslavers who forced them to work without pay.
By 1861, slavery had been outlawed in most Northern states. But it was still legal in the South. Enslaved people built the homes and other buildings on large farms called plantations. Many were forced to work in fields. Others worked in homes, cooking, cleaning, and caring for the children of their enslavers. Confederate states went to war to try to keep this way of life.
The Civil War raged on for four years. In April 1865, General Robert E. Lee, the leader of the Confederate Army, surrendered. Later that year, the 13th Amendment to the U.S. Constitution abolished slavery throughout the nation. Enslaved people throughout the country would gain their freedom.