Slavery was legal in the United States from its beginning as a nation, having been practiced in North America from early colonial days.
The Thirteenth Amendment to the United States Constitution formally abolished slavery in 1865, immediately after the end of the American Civil War.
Ten of the first twelve American presidents owned slaves, the only exceptions being John Adams and his son John Quincy Adams, neither of whom approved of slavery.
Andrew Jackson was an interregional slave trader until at least the War of 1812.
Woodrow Wilson was the last president born into a household with slave labor, though the Civil War and abolition concluded during his early childhood.