History was a driving force behind such migration, since humans tended to move to new territory when they lacked food, shelter, or other resources--meaning that most of the conflicts throughout history have been driven by the same forces that drove migration out of Africa.
Once a slave ship had a full cargo of enslaved Africans, the captain would set out on the next leg of the journey. This leg, called the Middle Passage , took the Africans away from their homeland, across the Atlantic Ocean to the Americas.
The Nullification Crisis was a United States political crisis in 1832–1837, during the presidency of Andrew Jackson, which involved a conflict between South Carolina and the government. It declared that the tariffs of both 1828 and 1832 were unconstitutional and unenforceable in South Carolina. ... Congress passed the new negotiated tariff satisfactory to South Carolina. The South Carolina convention reconvened and repealed its tariffNullification Ordinance on March 11, 1833.
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