Surprised to see that the Republicans didn't take the opportunity as IOTL to pack the Senate with Plains states, especially with what seems to have been a second civil war... also not really buying California with so little attractive power for at least internal migration. It's too damned pleasant in terms of climate and resources to take such a thorough backseat to the Old Northwest and Northeast for so long.
I have to say, though, the US having had a typical Western European 20th century should still pack some more educational firepower than it seems to ITTL, that list of top universities seems like it should come from a TL with middle-to-upper-middle income and politically fragmented US instead of "typical first-world instead of the premier global power".
The university question is an interesting one and I think it's worth bearing in mind two considerations, one TTL and one as compared to OTL.
Firstly, in OTL Germany has one university in ranked in the top 50 (by US News and World Report) and five in the top 100. And OTL Germany is, by any measure, a significant cultural, technological and educational power in the world. Secondly, TTL Austria and Germany retain their OTL preeminence in science and engineering, New South Wales becomes the centre for the imperial tech and aerospace industries (for reasons I will get to), meaning that their institutions are highly represented in the top tier. TTL GB's institutions are about as common in TTL's rankings as OTL UK's in OTL. Given that TTL GB is the heart of a world-spanning political, military and technological superpower and OTL UK is, well, OTL UK, this level of predominance doesn't seem implausible. The high placing of Brazilian, Russian and Indian institutions reflect the relative success those countries have had TTL as against OTL and are not, I think, particularly implausible placements either.
Overall, I don't think having two placements in the top 50 is a bad showing for a middle-power US. Also, bear in mind that you can have an excellent university education outside of the global top 50 TTL as in OTL, and their absence from this list shouldn't be taken to mean that places like Sarah Lawrence, Chicago or the UC system (or whatever) are complete dumps (although I suspect that the US will have much fewer tertiary education institutions OTL as compared to TTL, just because of the smaller student base).
I did some calculating with the help of google cause I suck at math, and calculated some nominal GDPs. Yes, we do know Germany, Austria, Bulgaria and a few others, but I wanted to help out and give some thoughts, Rattigan hearing your thought process would be cool.
Persia - 4.1 trillion GDP - relieved, because your previous timelines had Persia pretty poor in both. It got some love, and interesting that it uses the Afsharid flag, so maybe the Syncretic Sunni-Shia "Ja'afari madhab" is a success TTL?
Brazil - 10.5 trillion GDP - a consistent theme in your timelines of a developed monarchist Brazil, but do note I am NOT complaining lol. Perhaps it sees greater immigration due to America not having the pull of OTL (it did see great immigration even in OTL....)
Mexico - 3.6 trillion GDP - not shabby at all. Keep in mind this is *nominal* GDP, so its just over twice as rich as OTL.
Ethiopia - over 860 billion GDP. My guess given its large population its sort of an African Vietnam TTL, a still emerging but promising economy.
South China - 1.9 trillion, which, while it sounds large, is sort of disapointing given its population, however that is likely because while its not as hellish as North China, its still essentially a feudally rooted non democratic state.
Argentina - About 2 trillion flat. Pretty good. It will be richer than Mexico on a *per capita* basis because of its lower population.
A side question: The Austrian Empire has a pretty fine GDP per capita, and its population of 178 million impresses me. Assuming it is not a borderline autocracy like Russia, doesn't that likely mean it receives a good deal of immigrants, perhaps aided by the fact it has experience already as a multicultural nation?
Good thoughts on all of those. I hope to get to Brazil, Persia and Ethiopia soonish because, as you mentioned, I've basically gone for "These places are better than OTL" in all of the worlds I've built but not gone into much detail, and I hope to rectify that here.
On the Austrian population question, the 178 million has been retconned down to just under 100 million per the recent update on the Crownlands. (This reflects that this is still very much nascent worldbuilding rather than a complete TL, so apologies if it gets confusing and I'm always happy to clarify.) This does reflect a degree of increased immigration, particularly of Italians, but also a decrease in general emigration.
WTF?
The New York Metro IOTL is 6% of the population and 7.5% of GDP and said differential makes it quite rich already.
I don’t think that can really *happen* in even vaguely developed countries at this scale, it’s basically only ever been true of Hong Kong IOTL for a couple decades and even that is using pretty fuzzy definitions of “country.”
In OTL, Greater Tokyo is around 33% of Japan's GDP, Ile de France is around 25% of France's, and London is around 16% of the UK's. Obviously the situation for the TTL New York Harbor is extreme (that's kind of the point) but I don't think implausible for a region with such a concentration of population and industries.