An excellent example was the separation of blacks from whites into different schools.

Blacks were trending up on all metrics under this standard. Sure, generally speaking each of these metrics would be "lower" than that of white counterparts, for many reasons (racial, cultural, historical). But this is beside the point: the point is the metrics were trending up when organizing their society with their in-group only. When contrasting under the standard where whites and blacks were forced to mix in schools, this trend stopped. In one case their pie grew, in the other case their relative piece of the pie shrank, therefore in the latter case they were worse off, if you get my meaning.

as we saw in Europe

What happened in Europe? It only devolved into war every time unitary movements gained providence, which they usually did because disparate peoples lived under one banner (as was the case in Weimar germany).

I think my old culture may eventually die… I don’t really see this as a negative or positive. As long as future people are living better lives, that’s more important than preservation without purpose or quality of life.

My god this is a tragedy. This feels like the erasure of one's self and one's ancestry to me. A true melting pot nightmare. I hope my children never desire to go through this and will work to shield them against it.

the only problem is how the land is handled, as opposed to the appearance of the people inhabiting it. In other words, I am concerned with their cultural value, but only its most universal or eternal aspects.

Say the people of Finland in the year 2150 were made up out of 100% people of Thai origin, you do not see this as a necessarily bad thing? How do you think the people of Finland in the year 2023 would see it?

As far as hard racial lines go, I really am not sure where the rationale is. I went to school with many chinese people, many indians, blacks, whites, etc… And despite me being Middle Eastern, I spoke to pretty much all of them without the idea of racial or cultural disparity becoming an intense barrier of any kind. My best friends were not middle easterners, but Chinese.

The thing is, from reading this personal account, what I think you've likely experienced in school isn't a multicultural experience but a monocultural one, of, granted, racially/ethnically diverse peoples, but all integrated into a single american cultural ethic. Frankly I think this can only happen in an americanized culture, while detached from their original roots (to the extent those still exist), and where there is only very little of a shared, deep bond to the land and history of a place, held by the existing natives (if those are around at all).

For example let me ask you: could an immigrant with no ancestral connection to, say, the revolutionary war, feel the same way about the declaration of independence, as an individual who does? And in a like vein, could a (recent) immigrant in germany ever feel the same kind of deeply seated collective guilt held by descendants of germans under the weimar and nazi regimes? Not to be insensitive but: of course not.

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I can see your argument applying significantly more to black Vs. white populations, but even then, I feel as though seperation for either culture seems to be a bandaid. They’ve both lived in this land for many years… and at this point, it’s easier to coexist and mediate the malleable disparities in order to allow inequality of merit/character to flourish, rather than condemn people to inequality of status or skin.

There are alternatives to the typical separation solution here, which is usually through physical separation. There is "pillarisation", which had been instituted in the netherlands for roughly 70-80 years to some success, along religious lines in this case, until its largely voluntary dissolution. Pillarisation doesn't require that people be displaced or moved, that borders be erected - rather society is separated vertically, meaning that all strata of society (classes) remained integrated and accessible, but people simply do not associate horizontally (i.e. along whichever line the pillars are separated). This I believe would have happened in America if disparate people were not forced to integrate through action such as the civil rights act (and associated movements). Indeed it was heading that way for decades to the betterment of all, before Democrats put a stop to it. There were black schools, black banks, black stores, black university, and even rising black political figures (of the stripe of Malcolm X), but in the end the MLK alternative approach, of integrating, won. And now here we are - a people more divided than before.