The Civil War erupted 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 Northern states and the Southern states was slavery. At the time, nearly 4 million enslaved people lived in the U.S. They or their ancestors had been kidnapped from Africa and brought to America. 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 for decades. But it was still legal in the South. The free labor of slavery had made many Southerners very wealthy. Enslaved people had built the homes and other buildings on large farms called plantations. Many were forced to work in the fields on plantations. Others worked in homes, cooking, cleaning, and caring for the children of their enslavers. The Confederate states went to war to try to preserve this way of life.
The Union and the Confederacy fought for four long years. In April 1865, General Lee, who led the Confederate Army, surrendered. Later that year, the 13th Amendment to the U.S. Constitution abolished slavery throughout the nation. As a result, close to 4 million enslaved people would earn their freedom.