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The Constitutional Convention and debates over ratification

Problem

ESTIMATES OF ENSLAVED PEOPLE OF AFRICAN DESCENT SENT TO MAINLAND NORTH AMERICA VIA THE ATLANTIC SLAVE TRADE, 1751-1840
YearsNumber of enslaved people
1751176042,947
1761177046,691
1771178031,185
1781179014,298
1791180014,338
1801181072,978
181118204,635
1821183091
183118400
Adapted from Herbert S. Klein, The Atlantic Slave Trade, 2010
Which of the following best explains the changes in the population of enslaved Africans from 1801 to 1820?
Choose 1 answer: