What did the Missouri compromise say about expansion of slavery in the west?

The Missouri Compromise was United States federal legislation that stopped northern attempts to forever prohibit slavery's expansion by admitting Missouri as a slave state in exchange for legislation which prohibited slavery north of the 36°30′ parallel except for Missouri.

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"Congress enacted the Missouri Compromise in 1820 as a means to address the legality of slavery as the country expanded west. At the time, Missouri sought to gain admission as a state, the country was comprised of an equal number of free and slave states."

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