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In 1801, Congress extended Virginia and Maryland slavery laws to the District of Columbia, establishing a federally sanctioned slave code
In 1807, Congress banned the importation of slaves into the U.S., although smuggling continued in some parts of the South. Once the transatlantic slave trade was prohibited, domestic slave trading throughout the South increased
The 1820 census added free colored persons to its racial categories
In 1821, Missouri entered the Union as the 24th state and a slave-holding state, maintaining the balance of slave and free states.
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