The US was over 80% white, often over 90% white, for the vast majority of its existence [0]. It was relatively unified in race and culture for the last 400 years. Only since the 1960s/1970s was the immigration floodgates truly opened and the demographics significantly changed. If anything, the way things have been falling apart in the last 50 years is directly contrary to increased diversity of culture being beneficial.
Italians, Jews and even Irish were not considered 'white', which was reserved for descendants of British immigrants, due to the general racial theories that dominated the pre-WW2 era.
> It was relatively unified in race and culture for the last 400 years. Only since the 1960s/1970s was the immigration floodgates truly opened and the demographics significantly changed. If anything, the way things have been falling apart in the last 50 years is directly contrary to increased diversity of culture being beneficial.
It was relatively unified because blacks were subjugated until 1968, despite the bloodiest civil war in history liberating them from slavery 100 years before that. Where are you coming from with this?
Diversity isn't a problem in itself; we just have no singular culture for everyone to assimilate into so we trend towards chaos. "When in Rome" has never applied here.
[0] https://en.wikipedia.org/wiki/Historical_racial_and_ethnic_d...