That’s supposed to be a real scenario? A scenario, maybe, but real? Not by a long shot.
The French were in no condition to “keep” anything in what is now the Western United States. they did not populate it, they did not control it, and they sure as hades would not have kept it. Same for the Russians; neither country had the wherewithal to populate, control or protect any territories in North America.
How about this scenario: a Republic of Texas stretching from the Gulf of Mexico to the Pacific Northwest? That’s a scenario at least as realistic as yours.
That is a real scenario and for sure the dang wets would not be swimmin’ the Rio right now and there would be no Mexico City.
It would be called Austin South.....
Remember Goliad and Remember the Alamo....SECEDE....
I like your scenario better!