Final answer:
The Constitution banned the importation of slaves from outside the USA in 1808.
Step-by-step explanation:
The Constitution banned the importation of slaves from outside the USA in 1808. This provision was included in the Constitution as part of the Atlantic slave trade compromise agreed upon during the Constitutional Convention in 1787. The compromise allowed the continuation of the slave trade until 1808, after which Congress could prohibit it.
Learn more about Importation of slaves in the USA