My point is, vote! It's an interesting poll.
The thinking in the USA seems to be that either you're an immigrant or you're not, with no distinction between the variation of cultures. To a western European this kind of thinking seems very parochial.
The very idea of asking this kind of question makes it seems USA-centric, because the USA has such a strong self-identification as the land of opportunity for immigrants. The discussions about H1-B visas indicates the schizoid nature of that identity.
I've heard it said that the difference between Britain and the USA is that the British think 100 miles is a long way, while Americans think 100 years is a long time.
Again, all of this is my impression, but you did ask.
That's the ideal in some of the USA, but it's by no means the historical norm. The traditional thinking in the USA has always been that either you're an immigrant from Awesome Culture X or Y, and therefore the salt of the earth, or you're from Despised Culture Z or Q, and therefore a dangerous foreign influence that needs to be controlled.
The darkly amusing feature of our culture is the routine reshuffling of the categories.