in Brazil and Mexico there are still difference between White - Meztizo (Brown) - Indian, with generally richer class are whiter. There also regional difference with Coastal Area in Brazil and Mexico City and surrounding dominated the country.
in Indonesia there are difference between Javanese who dominated the country, Chinese as market minority who rich but religiously different and relatively powerless politically and militarily. There also regional difference, Makassarese (south-east Sulawesi) are quite dominant in Eastern part, In Borneo there are Malays, Maduran (Madurese?) (as immigrant traders), Chinese and Dayaks who had different economic dominance.
There also massive class system, there are several hundred family who thoroughly dominated politic and economy in Indonesia, Brazil and Mexico.
these family often practically marry each other, become elite class.
China and Japan is de-facto Uniculture state. language difference (or other regional difference) is minimized by national ideology and its own people self-consciousness. Taiwan also unicultural for same reason.
Singapore is de-facto dominated by ethnic chinese, and certainly neither equal or democratic. in the future Singaporean identity might dominant, but for now its Chinese identity is still strong.
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If Multireligious/Multi-linguistic/Multicultural/Multiracial Nations become successful, they will create new identity that de-emphasize that. so its unlikely that such state can exist. in USA whiteness (and protestanism in 19th century) provide unifying factor. in Switzerland, despite language and religious difference, they succeed create their own identity.
State with class/religion/linguistic/tribal/racial/cultural conflict surface and sub-national difference dominated people self-consciousness other hand would become unsuccessful.
