pop is one of the American genres of music

Given the truly international input into pop music and its deep roots in African & European cultures, how on earth can you say that it's one of the American genres?

Where's Spleen when you need him? Pop, like Folk, is not a genre, it is a process that has yielded a plethora of distinctive musics - certainly as distinctive & culturally significant as Folk, if not more so. Here's a few names for you to Google: Magma, Soft Machine, Gong, Univers Zero, Sigur Ros, David Bowie, Roxy Music, Third Ear band, The Man Band, Henry Cow, Jabula, etc. etc.