AHC: Mexico as a superpower

On Alternate History wiki there is a timeline called 'Mexican Empire' or something like that. It is very ASB and to be honest, reads like something Turtledove wrote (seriously, the CSA acting and being defeated like Nazi Germany and then somehow becoming a superpower like the USSR?)

Either way, the premise, of Mexico remaining a monarchy and becoming a superpower is reasonably good in my opinion. So the challenge is, make this work in a non-ASB way.

The criteria for success are:

i) Mexico must retain it's 1846 borders.

ii) It must have a GDP that is comparable to the OTL USA (bearing in mind it will include a huge section of the south-west and west coast of the United States).

Apart from that, anything plausiable goes
 
The 1824 seems to be the best time to start changing Mexican history. Make some changes to the constitution that allow for better representation by parties and less power to the President and more to a congress like government.

That should help deal with the instability that follows. Post that go along the Paraguay root. Become isolationist and focus on a self sustaining economy. The war with the US over Texas would certainly help.
 
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