<Li> David Walker, a freed slave from North Carolina living in Boston, publishes Appeal to the Colored Citizens of the World . He calls on slaves to revolt and destroy slavery . </Li> <Tr> <Td> 1830 </Td> <Td> <Ul> <Li> U.S. slave population in the 1830 United States Census: 2,009,043 . </Li> <Li> In North Carolina v. Mann, the Supreme Court of North Carolina ruled that slaveowners had absolute authority over their slaves and could not be found guilty of committing violence against them . </Li> <Li> Daniel Webster delivers a speech entitled Reply to Hayne . Webster condemns the proposition expressed by Senator Robert Y . Hayne of South Carolina that Americans must choose between liberty and union . Webster's closing words became an iconic statement of American nationalism: "Liberty and Union, now and forever, one and inseparable!" </Li> <Li> The National Negro Convention, a black abolitionist and civil rights organization, is founded . </Li> </Ul> </Td> </Tr> <Ul> <Li> U.S. slave population in the 1830 United States Census: 2,009,043 . </Li> <Li> In North Carolina v. Mann, the Supreme Court of North Carolina ruled that slaveowners had absolute authority over their slaves and could not be found guilty of committing violence against them . </Li> <Li> Daniel Webster delivers a speech entitled Reply to Hayne . Webster condemns the proposition expressed by Senator Robert Y . Hayne of South Carolina that Americans must choose between liberty and union . Webster's closing words became an iconic statement of American nationalism: "Liberty and Union, now and forever, one and inseparable!" </Li> <Li> The National Negro Convention, a black abolitionist and civil rights organization, is founded . </Li> </Ul> <Li> U.S. slave population in the 1830 United States Census: 2,009,043 . </Li>

Which event led to a crisis over slavery in congress