There is no culture on this earth that does not have its own rules and customs.While the US may be the most slack when it comes to dating rules, there are even some things in the US that are considered typical, such as the man paying for the first date or being the first to call. Two people meet, they enjoy each other and they find a way to make it work regardless of what kind of odds may be against them. Food historians tell us Tex Mex cuisine originated hundreds of years ago when Spanish/Mexican recipes combined with Anglo fare.Tex Mex, as we Americans know it today, is a twentieth century phenomenon.With this being said there are certain parts of the world such as the US in which American customs have somewhat worked to relax the Mexican dating rules.However, there are still a lot of Mexican people in Mexico as well as in the US that still expect their customs to be followed.
The woman tends to the children and that man brings the income in.
American women are not really raised as the submissive creatures that Mexican women are.
As a rule, American women seem to be very independent and free spirited and this can cause strife in a relationship in which the man is Mexican and the woman is not.
It is easy to see how this might not work out very well. None of this is to say that are not mixed cultural relationships everywhere that work out just fine.
The key is in figuring out together what the differences bare in terms of culture and working them out.