On this day March 6, 1820

The Missouri Compromise is signed into law by President James Monroe. The compromise allows Missouri to enter the Union as a slave state, but makes the rest of the northern part of the Louisiana Purchase territory slavery-free.

The Missouri Compromise prohibited slavery in the Unorganized territory of the Great Plains (dark green) and permitted it in Missouri (yellow) and the Arkansas Territory (lower blue area)

The Missouri Compromise prohibited slavery in the Unorganized territory of the Great Plains (dark green) and permitted it in Missouri (yellow) and the Arkansas Territory (lower blue area)

The Missouri Compromise was an agreement passed in 1820 between the pro-slavery and anti-slavery factions in the United States Congress, involving primarily the regulation of slavery in the western territories.

It prohibited slavery in the former Louisiana Territory north of the parallel 36°30′ north except within the boundaries of the proposed state of Missouri. Prior to the agreement, the House of Representatives had refused to accept this compromise and a conference committee was appointed. The United States Senate refused to concur in the amendment, and the whole measure was lost.

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