The US does not have an official language. We just default to English. There are bilingual schools, especially in bigger cities. It's typically conservatives who don't want bilingualism. Within major immigrant hubs, bilingualism and code-switching are very common, especially in multigenerational households. And most modern immigrants come to America willingly, seeking a better quality of life. Among the forced assimilations (Native Americans, Blacks), yeah, they lost a lot of culture.

Many other countries are multilingual and to some degree multicultural. Few are as homogenous as East Asian countries.

> Wouldn't it be hard to integrate into the business community if you didn't speak the official language of business in a given country?

Uh, so offer free Chinese language schools and economic opportunities. It doesn't require kidnapping them and putting them in concentration camps.