I'm not pro-American but I do see most modern musics descending from the country, gospel & the blues. Whether it be rock 'n' roll or rhythm 'n' blues etc it all roots from these musics. The only other influence is classical and brass band music which played its hand in Jazz music.
Personally I love Johnny Cash & Waylon Jennings the best. That or a bit of BB King
I also don't mind a bit of blue grass or mountain music.
http://www.youtube.com/watch?v=qck-s79efuw
http://www.youtube.com/watch?v=Uzae_SqbmDE
http://www.youtube.com/watch?v=4Ny5ajCn0xw
http://www.youtube.com/watch?v=lXniM9Ml8R0
On a more serious note. I think nowadays too much racial rubbish has gotten into the music scene. Especially in musics like rap. The truth is the poorer whites brought their Irish, Jewish and Russian folk musics across on the ocean which got mashed together to make the hillbilly sound and the black slaves picked up the instruments and reinvented the sound to make the blues. It wasn't about white and black but rather rich against poor. Slavery was just a horrific crime of the time. Nowadays it is the drug dealers and the pimps that are the one making slave.