Well im English and have many friends from all over the world many black and i have never been accused of being responsible for the slave trade! yes our ancestors as well as many others had a hand in slavery, but to accuse innocent generations down the line is ludicrous and unfair.
It depends on which version of slavery you mean. Are you talking about the Egyptians who enslaved the people of Israel? Are you talking about the American Indians who enslaved other tribes? Are you talking about the Africans who enslaved residents of neighboring villages? Or the Nordic people? Or maybe the Asians who forced THEIR enemies into slavery? I suggest most people only know about the slavery that involved African-Americans in THIS country. It also went on throughout Europe but became unacceptable before the U.S. outlawed the practice. Recognize that slaves were brought here by Dutch traders. The Dutch wanted to do business in Africa, but there weren't many things that they could use from the Africans, so they traded goods for slaves. Africans would round up their enemies and trade them to the Dutch traders for trinkets. Many of the Africans were planning to kill their enemies, but instead they decided that they could trade them away, never have to deal with them again and get some goods in the process. The South (U.S) was one of the last places that used slave labor. Other parts of the world had correctly decided that it was both inhumane and unprofitable. The sountern plantation owners couldn't imagine a way to work their crops without slave labor, so they resisted the pressure from the north to do away with slavery.
But, the US was not the last place to have slavery. What about the Soviet Gulags, Nazi concentration camps, the Japanese occupation of Manchuria. And it may also still be practiced in some parts of Africa and Asia.