It's huge, is still standing hundreds of years later, and yet it still failed to keep the Mongols out. The Berlin wall was made to keep eastern and western Germans separate, and yet it only worked sometimes. The wall didn't even do much, it was more the soldiers shooting them that kept them out. It's quite likely that if we were to try that in this day and age, it would either fail and be a waste of money, or the population of Mexico would decrease significantly.
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