sure--you have to go back hundreds of years for your evidence = bullshit
No you do not. Jim Crow laws were still in effect in southern states until 1964. There are still quite a few people living today who were affected by those laws, which were justified by a supposedly "seperate but equal" system.
Ever hear of the "Little Rock Nine"? Emmitt Till? The Montgomery Bus Boycott? The 16th Street Baptist church bombing?
All of these incidents occurred in the 20th century..
And before you go there...no, I don't hate America. But facts are facts.