AHC: More Unified 20th Century Classical Music that draws heavily from jazz

Challenge: Have 20th Century Classical Music be unified like the Romantic and Classical Periods that came before it, and have it draw heavily from OTL Jazz.
 
I hope that the mods would mind me bumping this, but I hope everything I type is intellectually valid!

The problem with this is that by this point in history (aka the "20th Century") classical music is largely divided among nationalistic and ethnic divides. (I would struggle to say that the Classical or Romantic periods were a unified school of musical thought, but that's another argument entirely). By the 1900s, jazz was well-underway. American music (which can claim most of its individuality from jazz IMHO) had already been largely influenced by the influx of Afro-American and Latino culture that sculpted the development of 'Classical' music in the 20th Century. After all, the culture had been encouraged in places like New Orleans since the conclusion of the American Civil War. As a result, musical styles such as (early) ragtime, cinquillo and habanera were nothing new in the South (particularly) by the turn of the 20th century - in fact, you could already state that they were already become an aspect of American musical heritage.

Nevertheless, the OP states that all modern 'Classical' music should stem more prominently from jazz. In my opinion, this is verging upon the impossible. European musical culture (which had dominated cultural trends for many centuries before) was simply too strong to allow the minority-associated musical culture of "jazz" into widely-accepted sonority. By this time - don't forget - most of the iconic European classical music had been written, and each nation (particuarly in Europe) had it's own individual musical identity.

In conclusion (because it's late and I'm knackered), whilst I can envisage a widely-accepted North American sonority based around a Classical setting of jazz - perhaps along Gershwinian lines or even Ives - in Europe such a movement will become a largely taboo subject. This is simply because of the strength of strong classical tradition, and the dominance of a well-established nationalistic agenda from at least the 1880s. Whilst this was most prominent in Central Europe (Germany, Austria etc.) the same was true for the periphery. In my opinion, jazz is limited to American homelands at least until the end of the First World War.
 
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