I grew up in a suburb of Milwaukee. As a city, it is probably one of the most segregated in the country. While the city has been making great strides in improving itself, its still rare to see people of different ethnic backgrounds living next to each other.
Additionally, there have been some bad incidents involving racial prejudices in recent history. A few years ago, there was a small riot between blacks/whites after the state fair. Which was then followed up with a neo nazi march countered by an anti-protest. Tensions still seem a bit high when I talk to my parents.