The US needed more techy people due to its own education deficiencies, and opened doors to educated and wealthy immigrants from all countries more equally around 1970. Before then, few people except from Europe and Mexico came in legally. The result was a tremendous boost for high tech and the university industry.
Such an influx of Asian and African young people coupled with continuing immigration from the our war-meddling efforts down south and elsewhere was bound to change the ethnic nature of the US. Young people have families. Europe has been similarly affected, but perhaps more so by the bigger wars south and east of them.
Slow ethnic blends can be relatively smooth. Assimilation happens. Rapid change is troublesome, as new minicultures are set up and the home country is eventually altered.
Pride, culture, traditions, language, dress, these things have to be approached very, very carefully in a polyglot mix. It has been published that the US will become minority white by 1950. I expect that it will be sooner.
I speak as a very, very white wife of a man born in India, three “half-and-half” children, and as a long-time teacher of English as a Second Language to universities and high schools in cities all over China and Thailand.
I recall what Tiger Woods, a man of mixed American Indian, white, African, and Korean ancestry answered when people asked him his identity. “Who am I? I’m Tiger.”