So is your “incompatible people are being forced to co-exist” imply that the US is no longer a cohesive entity? That we are no longer a unified nation of different peoples?
I would say that's increasingly true. In the past, the US was largely mono-lingual with English being spoken. Today the US is increasingly multi-lingual and that trend is increasing not decreasing. That's in large part due to government (mostly from the Left btw) bowing to "inclusiveness." It is possible today to not speak English and function quite well in the US. Documents are printed in multiple languages. The economy runs in multiple languages--that is, packaging comes that way, stores and other entities have accommodations for it, etc.
Even our ballots come in multiple languages now. So, the incentive to learn English is diminishing rather than being reinforced.
https://archive.org/details/bowlingalone00robe
It isn't new. This is one of the earliest academic works on how social cohesion in the US is collapsing. Civic engagement is falling apart.
Incompatible people in the US, whether it be culturally, linguistically, socially, or religiously, are increasingly allowed to co-exist with no social pressure to conform to those norms in society as they already exist. Groups calling for Shria law for example. In Europe, this trend is far worse than in the US, but it's coming here too at an increasing rate.
That Biden has for all intents opened the borders, he's letting in a flood of completely unvetted, often dangerous, people into the US without even the slightest supervision. It is going to cause a cultural disaster on its own. Yes, many will assimilate, but a good portion won't. They have little or no reason to bother doing so with the way things are here in terms of government.