Huh...did anons know this? Founding Fathers wanted slave imports to be limited to 20 years...
Federalist #38 Madison writes, "The Confederation has no bill of rights. Is it an objection against the new Constitution, that it empowers the Senate, with the concurrence of the Executive, to make treaties which are to be the laws of the land? The existing Congress, without any such control, can make treaties which they themselves have declared, and most of the States have recognized, to be the supreme law of the land. Is the importation of slaves permitted by the new Constitution for twenty years? By the old it is permitted forever."
http://www.let.rug.nl/usa/documents/1786-1800/the-federalist-papers/the-federalist-38.php