Slavery in the United States Slavery in the United States Slavery in the United States was the legal institution of human chattel enslavement, primarily of Africans and African Americans, that existed in the United States of America in the 18th and 19th centuries. Slavery had been practiced in British America from early colonial days, and was legal in all Thirteen Colonies at the time of the Declaration of Independence in 1776. It lasted in about half the states until 1865, when it was prohibited nationally by the Thirteenth Amendment. As an economic system, slavery was largely replaced by sharecropping. By the time of the American
United States Declaration of Independence Congress passed Adams's radical preamble, the Virginia Convention set the stage for a formal Congressional declaration of independence. On May 15, the Convention instructed Virginia's congressional delegation "to propose to that respectable body to declare the United Colonies free and independent States, absolved from all allegiance to, or dependence upon, the Crown or Parliament of Great Britain". In accordance with those instructions, Richard Henry Lee of Virginia presented a three-part resolution to Congress on June 7. The motion was seconded by John Adams, calling on Congress to declare independence, form foreign alliances, and prepare a plan of colonial confederation. The