You are right to some extent. In the ideal world,

we should have a way to conquer the cultural barrier. As I said, you are lucky to have an understanding hu*****and and mother in law. They are open minded and tolerant. They do not have too much prejudice againt other country and culture. And that is why they accept you as their daughter in law.

But still we cannot deny that there IS the barrier between the nations and countries. That is why we have wars. This is still something we need to work on.