If you go through the annual National Drug Threat Assessments, they give a more in depth break down from region to region. When it comes to drugs, African Americans are major wholesale players in Detroit. In California, it's a real mix of street gangs, prison gangs, and motorcycle gangs, in addition to the cartels.

For the last several years now, the main groups the Threat Assessments have listed, in the general sense regarding the U.S., have been the Mexicans, Colombians, Asians, and Dominicans. In some of them, Cubans were also mentioned but they've mostly been involved in high-grade marijuana in Florida. The Jamaicans have also been mentioned but they've also been mainly involved in marijuana distribution in New York. West African groups were mentioned in one report but didn't go into much detail. The LCN was mentioned in the 2009 report; it's drug activity mainly in the northeast not surprisingly. What was interesting is that the LCN traffics in several drugs (cocaine, heroin, marijuana, ecstasy, and prescription drugs) but is more on the mid-to-lower levels of the trade now.

I should add that the 2011 Threat Assessment was the last one since the government office who did them every year was shut down in 2012. But you can go and look at reports for the High-Intensity Drug Trafficking Area (HIDTA) in different cities.