And what's wrong with that? It's up to a country's citizens to decide who they want or do not want in it. If they can't decide even that, then in what sense is a country theirs? You don't see me giving China a hard time about not accepting tens of millions of African immigrants.
Ok, so you admit that the USA decided they do not want chinese, they don't like chinese and before 1960, no way in hell were they going to let chinese in (except for brides US GI's wanted to bring home as wives).