 
In the case of Prigg v. Pennsylvania, the U.S. Supreme Court rules that the 1793 Fugitive Slave law is constitutional, while state personal liberty laws make unconstitutional demands on slave owners. Enforcement of the Fugitive Slave law is declared the federal government's responsibility, not the states'.
1842
The Georgia legislature declares that it will never recognize free blacks as citizens.
1843
In reaction to the decision in Prigg v. Pennsylvania, New York, Vermont, and Ohio pass personal liberty laws.
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1844
Connecticut passes a personal liberty law.
1844
North Carolina denies citizenship to free blacks.
1844
Oregon prohibits slavery.
1845
Texas enters the Union as a slave state.
1846
Missouri removes restraints on interstate slave trade.
1846
Texas creates a system for patrolling slaves.
1847
Pennsylvania passes a personal liberty law.
1847
Frederick Douglass breaks with William Lloyd Garrison's abolitionist newspaper, THE LIBERATOR, to found a black abolitionist paper called THE NORTH STAR.
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