How come Asian people move to Western countries, but Westerners don't move to Asian countries?

If you travel to the U. S., Australia, Canada, or countries in Europe, you'll find large East Asian communities (Chinatowns, Korean towns, Little Tokyo, etc.). But if you travel to East Asian nations, like Japan or Korea, sure, you'll find some Westerners here and there, but there aren't large communities of Westerners. Why is this?

How come Asian people move to Western countries, but Westerners don't move to Asian countries?
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