America's Most Violent Cities 2009:

http://finance.yahoo.com/real-estate/article/106978/America's-Most-Dangerous-Cities

From: http://www.city-data.com/

The research:

1.Detroit- 82% Black

Black (61.4%)
White Non-Hispanic (33.3%)
Hispanic (3.0%)
Other race (1.5%)
Two or more races (1.0%)

Races in Stockton,California:

Hispanic (32.5%)
Other race (17.3%)
Black (11.2%)
Other Asian (7.9%)
Two or more races (6.8%)
Filipino (6.2%)
White Non-Hispanic (32.2%)
American Indian (2.3%)
Vietnamese (2.2%)
Chinese (1.8%)
Asian Indian (0.9%)
Japanese (0.6%)

Las Vegas Nevada is 42% Non-White:

Races in Las Vegas:

Hispanic (23.6%)
Black (10.4%)
Other race (9.7%)
White Non-Hispanic (58.0%)
Two or more races (4.1%)
Filipino (2.3%)
American Indian (1.5%)
Chinese (0.6%)
Other Asian (0.6%)
Japanese (0.5%)