Thought - provoking fact

Travelling is one of the most interesting activities in the world right?
But as for me, the most interesting part of this activity is the opportunity to open yourself up to a new culture.
Not long time ago I went to the USA. Since then it has been one of the most interesting but at the same time very contradictory countries for me.
But now I want to write not about the usa itself but about some interesting things that I've been suspecting for a long time but that became so obvious for me only in the land of the free.
As it is known the usa is very very very multicultural country. And the interesting thing is that most of the time people of the same culture stick together with the members of their own culture. For example Russian people try to stay together with Russians. The same happens with the members of other cultures.
Maybe it happens cause in new situations our brain always tries to find something habitual for us so it is easier for us to adapt to an unaccustomed situation. For us it is more interesting to talk to somebody who thinks like you, listens to the same music, likes the same food and so on.
This seems very thought provoking for me.
What do you think about it?