<P> The Act Prohibiting Importation of Slaves of 1807 ( 2 Stat. 426 , enacted March 2 , 1807 ) is a United States federal law that stated that no new slaves were permitted to be imported into the United States . It took effect in 1808 , the earliest date permitted by the United States Constitution . </P>
what restriction did the united states congress place on slavery in 1808
no new slaves were permitted to be imported into the United States