As bad as slavery was for black people in the US, its still going on today in Africa. It wasn't just the "White man" who enslaved black people, it was the Arabs who did it to, not to mention their own tribes were enslaving each other and then selling them to the White and Arabs. If your going to be mad about slavery then atleast admit it was your own people who sold your ancestors for profit.
http://en.wikipedia.org/wiki/Slavery_in_modern_Africa
"Slavery in Africa continues today. Slavery existed in Africa before the arrival of the Atlantic slave trade, as did an internal African slave trade and an Arab slave trade. Despite being illegal in all African countries, slavery continues in parts of Africa and the rest of the world."
http://en.wikipedia.org/wiki/Arab_slave_trade
"Historians estimate that between 10 and 18 million Africans were enslaved by Arab slave traders and taken across the Red Sea, Indian Ocean, and Sahara desert between 650 and 1900.[1][2][3][4] The term Arab when used in historical documents often represented a cultural term rather than a "racial" term, and many of the "Arab" slave traders such as Tippu Tip and others were indistinguishable from the "Africans" whom they enslaved and sold. Due to the nature of the Arab slave trade it is also impossible to be precise about actual numbers.[5][6][7] Additionally, approximately 11 million African slaves were taken to the Americas. Likewise, more than 2 million Africans died on the ship before reaching the destinations in the Arab world, therefore the slave traders would obtain the same amount of Africans in order to make up for the loss."
As far as importing Black slaves from central Africa goes, the North African and Arab people pioneered that first. About half of the slaves ended up in North Africa and the Middle east, while the rest ended up in the New world, our Muslim buddies were trading black slaves like it was fashionable for 600 years before Whitey decided to join them.