BZZZT! Sorry, incorrect. When slavery was instituted in the New World in the 17th Century, it was done by White colonial Britons. America had yet to exist. Also, slavery had a long and proud tradition in Africa, the Middle East, and Asia looooong before Europeans got into the business. Slavery was finally abolished by Americans, but we were about 10th to do so... but we had been struggling with the concept for several decades with the Compromises, etc. (Britain was one of the first, though. Maybe it should be Black British History month!)
Indeed, slavery is an inseparable part of the ethnicity of Slavs. The word derives from the Greek Sclava, or slave. So named because the Mongols regularly raided the steppes and captured these people as slaves, reportedly by the hundreds of thousands. Major Owens, notwithstanding...
It seems to me that Slavs, as a group, have "gotten over it". Though slavery is the derivation of their ethnic identity, it is but a footnote in their cultural history.
The blacks would do well to study their example.