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David T showed in https://www.alternatehistory.com/fo...exas-up-to-the-colorado-river-in-1819.383098/ that the USA could have gotten Texas up to the Colorado River in the Adam-Onis treaty in 1819.
What would be the effects of it happening?
I think, that, this might have ultimately backfired for the USA. As David T mentioned, this timeline's Mexican Tejas would have a lot less American settlers than our timeline's. The areas of Tejas west of the Colorado River, while, still, underpopulated, doubtless, had a larger population than the areas east of the Colorado River. In addition, Mexico might have been more capable of settling this smaller Tejas more. In this timeline, there would be no Texas Revolution.
How would the USA have expanded, in this timeline?
Could Mexico have managed to hold on to more territory than it did, in our timeline?
If so, how much?