Oxford was around but not in anything similar to the form you'd be familiar with, saying Oxford at the time is the same as Oxford university as it existed proper would be like comparing early roman settlers before rome was even a regional power to rome at the height of the roman empire.
Good things spics are just half europeans and half natives then then actually natives.
Anyways, the Aztecs and Incans were actually really impressive, they were both at least Roman tier, if not actually on par with Europe at the time in a few ways. The incans had absurdly amazing stoneworking skills and actually had the largest empire in terms of landmass on the planet at the time. To say that they couldn't even build castles as in is just ignorant, they did, and in ways nobody in europe could have matched.
For the aztecs, they had the most advanced hydro-engineering techniques on the planet, their captial was built on a lake that they built artificial islands on and had venice tier aqueducts, canals, causeways, dykes, levies, and drianage systems to keep clean water in and brackish swampwater out. When the spainish destroyed everything, they couldn't figure out how to rebuild it and New Spain/Mexico city suffered from constant flooding and other issues, so they had to drain the lakes, and now even today mexico city suffers from flooding and soil liquification issues due to it. Spanish accounts from conquistadors also consistently mention their palaces, gardens, markets, temples, and even just residential upper class homes being as good as or in many cases much more magnificent and cleaner then what was in spain, which is backed up by ruins still in mexico city.
Also, both the Aztec and Incan captials were on par with Paris and Constatipple in terms of population, being tied for the 5th largest city in the world at the time. Lastly, the Aztecs did what they did without any sort of beasts of burden and only founding their captial 200 years prior and empire 100 year prior.
Putting the Native mesoamaericans and andeans in the same group as subsahran africans is absurd. Had the America's been given another 100-200 years to devolp or had the Spainish not arrived right as both the Aztecs and Incans were in a huge geopolitical clusterfuck that made them vulnerable, they likely would have modernized as fast as Japan did.