In the colonial period there were Slaves in all the 13 colonies
Yes, there were, but the majority of slaves in North America were concentrated in the South due to the difference in the Northern and Southern economies, which is what I said.
African Americans do have equal rights, and while there are whites who believe in white supremacy and are otherwise racist There are blacks to who are racist towards whites or other racial backgrounds.
The United States is a white supremacist country in the year 2015, "legal rights" are largely meaningless when the economic and social structure of the society disenfranchises blacks at every opportunity.