Northwest Ordinance
(1787-1789) (may 11, 1787 – mar 11, 1789)
Description:
"The Northwest Ordinance forbids slavery in the Northwest Territory (later Ohio, Indiana, Illinois, Michigan, and Wisconsin). Slaveholders can, however, bring slaves with them to the region."
Source:
https://www.nationalgeographic.org/interactive/slavery-united-states/
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