Taking effect in 1808, during Thomas Jefferson’s presidency, the United States officially prohibited the transatlantic slave trade. While the transatlantic slave trade did not come to a sudden halt, it became a criminal offense to capture and import Africans to the United States. Some ships, however, continued to smuggle in persons from West Africa and the Caribbean. Half a century later, in 1860, the number of enslaved people in Louisiana had multiplied sixteenfold, with over 331,000 enslaved.
