It's quite easy to integrate into a culture when the culture itself is relatively young, and by virtue, relatively shallow in comparison to older cultures.

It also helps that most Americans are not direct, so we can all pretend to get along. Whereas in other cultures, like Dutch, Oceaniac, Egyptian, etc., it would be made plain when someone has a problem with you.

These are either positives or negatives depending on one's values, and incentives.