Most Jews were no immigrants. They had been living in Germany for centuries. Ironically, during most of that time, Jews were forced to be different, banning them from most occupations and from owning land. Modern North-American culture is based on integration and assimilation.

Basically, anybody can be American, if you think and do like they do. A major step forwards from blut und boden. If only we could also accept those who choose to remain different.