Blues was always strong in the U.S. The Brits didn't revive it, they moved it into rock and pop music for the white people. Blues, Jazz, Rock n' Roll, Gospel, Bluegrass, and Country all originated in the U.S. These are roots that got filtered into all the popular music for decades. Certainly no reason to think the Yanks were outdone by the Brits or anyone, for that matter.
Getting Blues more into the rock music and exposed to the masses was one the greatest things the Brits did IMHO.
