Why do you think Mexicans have a hard time assimilating and is it a problem or is it okay for them keep their culture alive in USA?

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Ever been to Texas and seen how many wave Mexico flags? Is it a problem or totally okay? Your honest opinions?
Why do you think Mexicans have a hard time assimilating and is it a problem or is it okay for them keep their culture alive in USA?
Why do you think Mexicans have a hard time assimilating and is it a problem or is it okay for them keep their culture alive in USA?
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