It depends on what "heavily Catholic influence" means. A Catholic can look at the old Protestant work ethic which had a lot to do with the original American culture and make it their own, or he can be a marxist liberation theology type of Catholic.
To some Protestants, it doesn't matter. The Bob Jones U. "church lady" crowd, for example... "You're Catholic, you're goin' to hell!" It's that kind of immature judgmentalism that makes me ashamed for some Protestants...