In my opinion this idea of "wall" that it has spread all over the world don't have a positive response to the population but it server only political and economy ends.
The people decided to escape in other country for war,work and for to find a better condition of life but all this makes the state lose its identity.
The identity of state represents the culture and traditions that the people live in that state.
When two cultures confront each other, the comparison can be conflicting.
But second me throught the respect and reciprocal solidarity this problem can be defeated.