Buying them from the Muslims slave traders in Africa.
Although muslims participated in the slave trade, their role was rather small.
Most slaves were captives taken when one African tribe raided another tribe, and then sold them to Christian ship captains.
Jews financed and owned the slave ships used to transport the slaves to the America's, and then sold the negro's to Christian slave traders in the New World
Muslims WERE the slave trade. Europeans bought slaves at Muslim slave markets.
Get real.
In March 1785, Thomas Jefferson and John Adams went to London to negotiate with Tripoli's envoy, Ambassador Sidi Haji Abdrahaman (or Sidi Haji Abdul Rahman Adja). When they inquired "concerning the ground of the pretensions to
make war upon nations who had done them no injury", the ambassador replied:
It was written in their Koran, that all nations which had not acknowledged the Prophet were sinners, whom it was the right and duty of the faithful to plunder and enslave; and that every mussulman who was slain in this warfare was sure to go to paradise.
He said, also, that the man who was the first to board a vessel had one slave over and above his share, and that when they sprang to the deck of an enemy's ship, every sailor held a dagger in each hand and a third in his mouth; which usually struck such terror into the foe that they cried out for quarter at once.
"American Peace Commissioners to John Jay," March 28, 1786, "Thomas Jefferson Papers," Series 1. General Correspondence. 1651–1827, Library of Congress. LoC: March 28, 1786 (handwritten).
^ Making of America Project; Philip Gengembre Hubert (1872). The Atlantic monthly. Atlantic Monthly Co.. p. 413 (typeset) (some sources confirm this wording,[15][16] other sources report this quotation with slight differences in wording