Unlike in Ireland, where one can be easliy defined as Irish, defing someone as American is inaccurate seeing as the country is roughly a hundred times bigger. Because America is so large, we actually have to specify what blood we've got in us when talking to each other. And there is no prouder blood to claim than Irish blood,(one could maybe argue Italian), because they had to put up with a lot of crap and prejudice(not nearly as much as the blacks, but a close second)
1.)Blacks and Irish need not apply
2.)Real Paddy: You're American
Irish-American: I'm Irish-American, America's a big fuckin country.
Paddy: You don't count, you're a yank, a wanabe.
Irish-American: My grandparents were born in Ireland, I think that gives me some big fuckin ties to it, you elitist douche.
Paddy: Feck off