Slavery, Racism, and Family?

Slavery is now accepted as socially and morally wrong at least in Europe, USA, and Russia. Other parts of the world it is listed as social class, part of their culture, or other yet still frowned upon. You say the word slavery and immediately everyone thinks KKK, the bad ole CSA and the civil war. Yet, no one thinks of the Greeks, Romans, Persians, Egyptians, Mongolians, or even the Native Tribes of North (to include Canada), Central, and South America. Read History. Slavery came as one group of people conquered another, those who survived worked for those who won. Another point peopl miss is that they forget many groups were eventually overran by their slaves. Spartans, Jews from Egypt, different tribal groups from Africa and the Americas. Yet the main thing folks miss is that Tribes from Africa traded for gold those who would become slaves here in the Americas. My question is : Is slavery only in reference to Blacks and the racism that came from modern removal of slavery and forced cohabitation of slaves with their former owners or is it an international concept? Most slaves when they got their freedom went as far as they could away from where they were slaves unless they conquered their former owners continuing the circle of slave and owner, yet in the USA people thought there would be no hostility of freeing former slaves and making their former owners live next to them.