Slavery in the United States
While Jefferson was president, Congress prohibited the importation of slaves, effective 1808. Although smuggling (illegal importing) through Spanish Florida was common. Slave trading within the United States, however, continued at a fast pace. This was because there was a need for labor due to the creation of cotton plantations in the Deep South. New communities of African-American culture were created in the Deep South. There were 4 million slaves in the Deep South before they were set free.