Why most banned immigrant are contained by Miaim and LA?

I'm speaking about Cubans/Mexicans, why only those places?
Answers:   
they're here in LA cause we're only 2hrs from the border
Cause Canada is too dam cold.
That is not completely true I live in Houston and here are a lot here. And San Antonio, Phoenix and many other places on the borders or south part of the United States. There are also some illegals within a lot of other places in the United states But the southern states commonly have more because they are closer to the border!


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