American as a term, is a nationality description. When they say Japanese only, they truly only mean Japanese only. No Chinese, No Koreans. So in all intents and purposes, its the same as the 'Whites only/ Colored only' signs. Its flat out racism. Simple as that, just like segregation.
Cultural preservation is simply an euphemism for isolation. Its not just to foreigners (as in internationals) but even within Japan. New neighbours are not tolerated simply because they didnt grow up in the area. Taking DECADES to assimilate if... (
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