I guess Vinland is not necessary. I just want highly advanced states in the americas by 1492.
Still, thinking about a PoD in the 900s, could the following be true?
-Chichen Itza vassalizing the surrounding mayan city-states of the Yucatan Peninsula, and on the way towards centralization.
-Either a Taino state in the Caribbean, or Mayan independent settlements.
-Mixtec city-states filling the Isthmus of Tehuantepec.
-Toltecs dominating Central Mexico.
-Tarascans firmly hugging the pacific coast of mexico.
-Missisipian city-states along that river.
-Large Iroqui Empire centered around the St. Lawrence and New England.
The biggest problem here are the Toltecs. There is simply no archaeological evidence they existed as popularly believed. Most if not all we know about the Toltecs comes from Aztec historiography, which is unreliable to say the least. They probably invented them to give themselves a claim to legitimacy, pretending to be the heirs to a civilization that supposedly dominated the area before them. But the problem is that more contemporary histories to the "Toltecs" give no indication they really existed. What we know of the time period suggests that central Mexico was dotted with numerous city-states at this time who were jostling for power to fill the vacuum left by the fall of Teotihuacan. The most prominent was probably Cholula.
The word Toltec for that matter is really just a Nahuatl word meaning something like artisan. They went out of their way to depict the Toltecs as some sort of perfect civilization, like a Mesoamerican Atlantis, and claimed it was a massive empire. And until recently it was popularly believed the Toltecs were the ones who founded Chichen Itza, but this narrative falls apart when you consider that Chichen Itza is actually larger than Tula, the supposed Toltec capital "Tollan". If anything the influence went the other way. But past historians seem to have just taken the Aztecs at their word, despite the fact they should've known that Tlacaelel burned all Mexica histories during his reign.
Now, that said there could still feasibly be an empire in central Mexico dominating the others at this time like Teotihuacan before and Tenochtitlan later, but it'd be best to ignore the claims of a Toltec civilization doing the ruling. The most likely candidate for a Terminal Classic central Mexican hegemon would definitely be Cholula. I think it was still the second biggest city in Mesoamerica when the Spanish arrived, and it still has the largest monument in the world by volume at least. And Mixtec histories also refer to Cholula. The greatest, or at least most famous, Mixtec warlord, 8 Deer Jaguar Claw, was recorded making tribute to Cholula in the 1100's IIRC.