Slavery was prohibited in states north of the 36°36', and this line continued west until California, which was completely admitted to the Union as a free state. In turn, slavery was allowed beneath the line. Missouri, on the other hand, was allowed into the Union as a slave state. This allowed for the amount of slave and free states to stay balanced to preserve the status quo in Congress.
C.
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That’s the Monroe doctrine, which basically said that the Americas were closed to anymore colonization from European powers.
