 
The U.S. purchases the Louisiana Territory (the area that later became Louisiana, Missouri, Arkansas, and Florida) from the French.
1803
South Carolina opens a new port to accommodate the importation of slaves from Africa.
1803
Ohio is admitted to the Union as a free state.
1804
The U.S. prohibits the importation of slaves from foreign territories into Louisiana.
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1804
In Pennsylvania the Underground Railroad is officially established.
1804
New Jersey enacts laws meant to introduce gradual emancipation.
1804
Ohio passes black laws to deter runaway slaves from settling in the state.
1805
Virginia allows slaves to accompany white masters to religious services presided over by white preachers.
1806
Virginia requires slaves to leave the state within a year of manumission.
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