Act Prohibiting Importation of Slaves takes effect in the United States

Background. Article 1 Section 9 of the Constitution protected state involvement in the Atlantic slave trade for twenty years from federal prohibition. Consequently, a federal law abolishing the international slave trade could only take effect starting January 1, 1808. Prior to this, individual states had varying policies, with South Carolina reopening its trade in 1803, while others had prohibited or restricted it.

Legislative Process. President Thomas Jefferson called for the enactment of the law in his 1806 annual message to Congress, denouncing violations of human rights. Under the leadership of Varnum, legislation moved through Congress, passing both houses on March 2, 1807. The bill, titled An Act to prohibit the importation of slaves into any port or place within the jurisdiction of the United States, from and after the first day of January, in the year of our Lord, One Thousand Eight Hundred and Eight, was approved on that date and signed into law by Jefferson.

Scope and Limitations. The 1807 law criminalized all importation from abroad, including on foreign ships, but did not affect the domestic slave trade within the United States. The act specifically targeted the import or export of slaves, leaving internal trade between states unaffected. This distinction meant that while international importation was banned, the internal market for enslaved people continued to operate.