Slave and free states

In the history of the United States of America, a slave state was a U.S. state in which the practice of slavery was legal at a particular point of time, and a free state was one in which slavery was prohibited or being legally phased out at that point of time. Slavery was a divisive issue and was one of the primary causes of the American Civil War. The Thirteenth Amendment to the United States Constitution, ratified in 1865, abolished slavery throughout the United States, and the distinction ended.

Early history

Slavery was legal and practiced in each of the Thirteen Colonies. Organized political and social movements to end slavery began in the mid-18th century. The sentiments of the American Revolution and the equality evoked by the Declaration of Independence rallied many black Americans toward the revolutionary cause and their own hopes of emancipation. Others joined the British army, encouraged by British promises of freedom in exchange for military service. Free black men also fought in the Revolution on both sides (see Black Patriot and Black Loyalist).