Blocking mass movements of people from other civilizations into yours is not a bad thing.
There are 122 million Mexicans, who are basically American Indians Civilization, not European.
There is a reason why The Great Wall Of China was built. It was built to block the Mongols, and then the Manchus, who could otherwise simply ride, or even walk, into China.
That is also the primary reason why China turned away from its coastal border, and from engagement with long distance oceanic trade after 1500, in order to concentrate on the Mongol threat which had been ever present for hundreds of years.
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