multicultural society, an opportunity or a mistake?

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I come form Brasil, probably one of the most multicultural nations. We have european, african and indian roots, and all was quite mixed with the times. This is a litle bit different from the USA, where especially black and whites are not that mixed like in brasil (we call the people here with black and white parents mulata). Although Brasil is such homogenous mixture, i cant say that there are no prejudeces between the rqaces. There are and not too less. The white south has prjudices against the more black north and vice versa. In comparison to other countries these prejudices for sure are little, but they are here. I see many advantages of a multucultural society, its interesting to know other cultures and other points of view and way to live. But i can understand that people also may see disadvantages (without being a racist). What is your opinion? Does the daily living between black and white and indian in USA and other nations work? could it be better? should it be better or is there already too much mixture between the races?