If race riots do happen, they will be from the growing number of butthurt white supremacists, not the disenfranchised people of color.
It's not the color who divide the people, especially in criminality.
Envidia te mata !!!
The blind leading the blind !!!
I think that the most likely scenario for mass rioting in the US would be due to US economic trouble and the cuts to social programs that follow. While the riots that may happen wont be a racial riot per say it will likely consist of mainly minorities who more heavily rely on these social services.