The Original Blood and Crip gangs originated in LA after the Black Panthers dissolved. The gangs are now widespread across the country from Fresno to Texas to New York but mainly for drug trade and not the original causes that spurred the creation of the original sets.
Also there are plenty of other gangs non blood nor crip who uses red and blue as their primary colors
DJ Quik and Ice Cube (Both Rappers are from Los Angeles) touch the subject of bloods and crips from out of town.