Missouri Joins the United States as 24th State
The Louisiana Purchase had opened vast western lands, and Missouri Territory residents petitioned for statehood in 1817. Debates over slavery's expansion led to the Missouri Compromise of 1820, admitting Missouri as a slave state while banning slavery north of the 36°30′ parallel in remaining territories and pairing it with Maine's admission as a free state. After the compromise passed, Missouri drafted a constitution and awaited final approval. On August 10, 1821, President James Monroe proclaimed Missouri the 24th state. The admission balanced sectional interests temporarily but highlighted deepening divisions over slavery that would erupt decades later.
