The Holocaust maybe? You know, that period in the last century when 6 MILLION WHITE PEOPLE were denied all of their rights, and subsequently murdered in the concentration camps of Germany and Poland?
I love how people get all riled up over things like this, but they only really look at a small part of a much bigger picture. Slavery, being looked down upon because of your social class, being treated as a lesser person, if a person at all, has been going on since the beginning of mankind. If you really want to get into it, its still going on today. People in the middle east sell their children to richer people who then use them as slaves, and at times they are brought to our country, where they are forced into caring for the families that bought them. There was a story out of Los Angeles in the last year, about a girl that was one of these slaves, until a neighbor became curious enough to question why she never left the house to go to school. Why don't we focus on solving that issue instead of focusing on something that happened almost 200 damn years ago?