1790 Mayans vs Americans

Here is the scenario.

Spain does not explore Mexico and Central America, same a Portugal. This means that the English and French still have their colonies. But they never investigate the southern areas. After the American Revolution the Aztecs investiagte the north and encounter the Americans. They slay all French settlers and build cities on top of their settlements. America, Britan and France stay out of contact. 1813 arrives and the British never start the war of 1812. But the Aztecs launch a suprise attack on the Americans. What will happen?
 
ASB. The Butterfly Effect would not allow the United States to exist virtually like OTL if the Spanish don't explore Mexico. Besides why wouldn't the Spanish or anyone else do that considering that it was one of the first stops for Europeans OTL.
 
However, you might get Mayas vs. Americans in 1780-s quite realistically... if the Spanish America to 1697 is precisely as per OTL.

If the PoD is that the Maya Kingdom of Tayasal starts to trade with the English of British Honduras at the end of 17th century, modernizes and repels Spanish attacks - then goes on the offensive as English ally every time there is a war between Spain and England?

Spain and England were at war during ARW. Siege of Gibraltar et cetera.

Now, imagine that the Kingdom of Tayasal has, by 1779, grown sufficiently large and modern (e. g. after being on the winning side in Seven Years War and keeping some chunks of Spanish area, like Yucatan), that they are able to conquer Mexico outright. And send expeditions to mop up the rest of Spanish North America, including Louisiana.

Tayasal, being the ally of England, automathically is at war against Americans in Ohio valley. But not awfully enthusiastic ally. The Mayas are perfectly aware that they have conquered a huge population of people talking different languages and with little enthusiasm for heathendom. So, their priority would be keeping what they have seized, and they´d very much like quick peace with 13 States.

What next?
 
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