You ever wonder about that? Where I live you'll see lots of hispanics, followed by Hmongs, blacks, Indians (from India), and lastly whites. My dentist is Japanese; he's the only Japanese American that I know of that I could go out and locate easily. In my daily ventures, I never see any Japanese.
At points in time, the Japanese economy has been pretty shit. It's an ethnostate, but they also have their fair share of problems. Most of the immigration has been economic, I think.
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