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@Wrick-It-Ralph
America has survived with differing cultures since it's genesis and so have a lot of societies in fact.
These societies assiliminate within American society. The illegal Hispanics are not assiliminating within society. They tend to not learn English. Many don't want to. Historically, it has been significantly different. We have had immigration waves previously but when they happened, there were many different nationalities coming. Intercultural marriage and reproduction was common and the children tended to feel more American then let's say Polish or Italian. The Hispanics are different. When their Nations interbreed( example is a Mexican marrying a Dominican), the offspring tend to feel more Hispanic instead of just American. This becomes problematic when unassimilated Hispanics made up a majority of certain states. Currently this is not the case. I don't think any state in the Union has a illegal immigrant majority, not even states like California and Texas. Once they make up an overwhelming majority, then that would be as likely to break away as PR, and many Puerto Ricans voted to be a freely associated country. They cite cultural differences.
Forced assilimination is called part of the legal process. Forced assilimination when the group can break away is called keeping the country together.