By the way, I think the first proper punk album is 1970's "Fun House" by the Stooges who hailed from Michigan. Yeah, I know it wasn't called punk at the time, but all the evidence is there - the music, the sound, the production, the attitude. There's MC5 too... before that you have all those bands on comps like "Nuggets" and some of them sound 10 years ahead of 1976. Death, Pure Hell, the scene in New York... I know British music was also a influence but I always thought of punk as being a US thing.
I read somewhere that The Ramones wore ripped jeans because they couldn't afford new clothes, while the kids in England ripped theirs as a fashion statement.
All in all it was just a sign of the times on both sides of the pond and beyond, even in communist countries...