As noted, Jethro Tull, U2, AC/DC, A-Cooper, P-Floyd, etc, (Troggs? Aerosmith?) are not american... BUT Hendrix, Zappa, Velvet U/ground, Allman Bros, S-R Vaughan band, Doors, are/were (unfortunately for those in past tense).
Cheers!
Cheers!
Greatest American Rock and Role Bands of ALL Time