I was just wondering what makes a band be able to say, "we're an American band" (my tribute to Grand Funk Railroad

)
Their sound, where they formed, where the members are from?

. I guess that it's up to ourselves to decide personally. I don't consider CSNY an American band because of Graham's first band, The Hollies. They were a part of the British Invasion, so it's hard for me to say that a member of that band became a member of an American band.
Fleetwood Mac are my 2nd favorite band, behind Bad Company. I love just about everything that they have done. I believe that most people refer to them as British American. Regardless, they rock!