AHC: Extend the life of the 1st Mexican Empire

Using any POD from 1800 to the end of the 1st Mexican Empire, find a way to extend the existence of the Empire by at least a decade, and if possible, all the way to World War I or beyond.

If necessary, that POD start date can be punted back some.
 
The Mexican Emperor is the Spanish King, a la the United Kingdom of Portugal, Brazil and the Algarves.

With Iturbide? No. No. No. This is one of the few implausible parts of Decades of Darkness, btw.
EDIT: Actually, in Decades of Darkness, Iturbide stops the French from trying to reconquer Mexico for the Bourbons. IOTL, Santa Anna got this credit against Spain in 1829, and it helped him until the Mexican-American War. So that would work.
 
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There was a moment when both Guadeloupe Vittoria and Santa Ana could have been captured by Iturbide's army, and this to me presents the best possible PoD for the Empire.

Best Regards
Grey Wolf
 
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