We all are prejudiced against something. It just takes a smart person to realize that this is a stupid way to think and look further into that person. The world is made up of many different races and cultures. What a boring place it would be if not. Black people gave us many things like music for example. How can anyone diminish this contribution? Yes, slavery was a bad thing. But think about there would be no Blues or Rock and Roll if ancestors of these slaves never came here to America. And Mercedesjin, for you, what if they never took slaves to the Caribbean? Not only would there be no Reggae or Calypso, there wouldn't be a you.
I'm sure you think you need to fight to change people's minds about racism, but truth is that racists minds are already closed and no amount of fighting or talking will change their minds. Try to change their minds through positive example. Most people on this forum are open minded already since they love Japanese culture, so I doubt you will find a lot of racism here.
You sound like a beautiful lady and I understand what you are saying. Just go show the world how beautiful you are and change the minds of those who are willing to change by the example you set. To Hell with the rest of them.