Missouri Compromise - Wikipedia

Missouri Compromise - Wikipedia: "The immense Louisiana Purchase territories had been acquired through federal executive action, followed by Republican legislative authorization in 1803 during the Thomas Jefferson administration.[26]

In the years following the War of 1812, the region, now known as Missouri Territory, experienced rapid settlement, led by slaveholding planters.[27]

Prior to its purchase in 1803, the rulers of Spain and France had sanctioned slaveholding in the region."