Segregation In the U.S.A

This is a complete off-topic, and definitely not a "fun" topic - interesting diversion, though.

A really interesting article on Wired magazine (fount right here)that has some really mind-blowing infographics about population distribution in major U.S. cities, such as Los Angeles, Chicago, Detroit and many others.
It shows you how entire neighborhoods in these cities are strictly Caucasian, African American, Asian, or Latino, with very little integration.

It does make you think - is the U.S. just not as tolerant as I imagined them, creating borders within cities for each major group of minorities*, or does it just mean that people naturally tend to cluster according to their racial make up?

*of course, minorities consists of more than 50% of the population in the U.S.

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Interesting maps. Personally, I'd agree with your second explanation that some people naturally tend to cluster according to their racial make up. Perhaps they feel more comfortable when they're in familiar environments. I remember when I was in high school, the Greeks would hang out together, the Asians were in another group, and the Australians were in a different group. They were all friends, and they were all on good terms with each other, but they tended to hang out with their own "racial" groups at recess, lunch time and during school breaks and excursions.