You are misguided. Thats as nice a term as I can put on this.
The Slave trade began as something of a European Business. Not American. There was no such thing as American until the revolution separated the Colonists from England. Up until then, and somewhat even after it, they considered themselves British Citizens.
Want proof?
Portugal -
http://africanhistory.about.com/libr.../aa101101a.htm
There was a very small market for African slaves as domestic workers in Europe, and as workers on the sugar plantations of the Mediterranean. However, the Portuguese found they could make considerable amounts of gold transporting slaves from one trading post to another, along the Atlantic coast of Africa. Muslim merchants had an insatiable appetite for slaves, which were used as porters on the trans-Saharan routes (with a high mortality rate), and for sale in the Islamic Empire.
The Portuguese found Muslim merchants entrenched along the African coast as far as the Blight of Benin. The slave coast, as the Blight of Benin was known, was reached by the Portuguese at the start of the 1470's. It was not until they reached the Kongo coast in the 1480's that they outdistanced Muslim trading territory.
England -
http://www.antislavery.org/breakingt...dkingdom.shtml
The British trade in African slaves began with Sir John Hawkins's illegal shipment of slaves to the Spanish West Indies in 1562. In its heyday in the latter half of the eighteenth century, Britain accounted for half of all the slaves transported across the Atlantic Ocean. The bulk of the trade was to the West Indies, Jamaica in particular, amounting to more than 1.6 million people in total. By the end of the 18th century, Britain had become the largest and most accomplished slaving nation in the world.
Major European Powers:
http://website.lineone.net/~stkittsnevis/slavery.htm
"Portugal, Spain, Britain, France, the Netherlands, Denmark and Sweden."
I know, though I am not wanting to go and find the proof, that the largest collection of slaves in the Triangle trade were set in Brazil and the Carribean, primarily within the Spanish colonies. It's one explaination for why there is a large amount of dark, 'african' skin and features in Brazil and some of the Carribean. So it's far from solely or primarily America's fault. Those that practiced in the slave trade, from the European powers to the Muslim Traders and African Kings, are all at fault. I'd figure only those that were actually enslaved had no part to play in the blame.
I found those links in a half-assed search. I am sure that with more research into reliable sources, I could find it. Europe was not without sin in the slave trade. That's the honest truth. America just took longer in abandoning it, and its a point being hammered to me in a class taught by someone who is very 'into' the role of africans in the history of America (American civ history class for 11th grade), that the north was not the good and the south the outright evil. The sailing business up in New England and the regions surrounding it, according to my teachings in said class, paritisipated in shipping slaves.
In short, Its not as easy as saying one group or any other was good or evil. All those that participated in the slave trade were sinful, and evil'. In their attempts to abolish the practice, they were able to redeem themselves, but it's not as easy as saying the group that stopped it the slowest is evil.
And it is interesting that America gets the sole blame. I've been trying to find the proof behind it, but I believe that the ottomans and other Muslim powers were practicing the slave trade into the 1800s. Theirs was not racially motivated, I think, which is one reason which perhaps the Slavery of Europe and America is the most 'evil'.