Whites are the most tolerant people on Earth.
TODAY, whites are probably the most tolerant people on Earth, but it wasn't that way up until pretty recently in human history. The bottom line is whites did engage in the slave trade, regardless of who did it before them. Whites did invade other parts of the world and succeeded in or attempted to colonize them, but the natives didn't necessarily get the benefits of that. Whites in this country DID discriminate heavily against people who were not white (and a few ethnicities who were and not part of the "in crowd" ie. the Irish). Many of the problems we have with race in this country and others wouldn't exist today if white people in the past had simply treated everyone like human beings. That doesn't mean it's an excuse for failure today, but it doesn't mean you can also whitewash the past and pretend it isn't a predominant factor.