Well what i was thinking was that if mexico chooses miliyary expansion in their event choice, then this set of events occurs. If not they should be turned off. I am also thinking it would be best that if they win their land back, then they should go south after. A possible alliance between central and united provinces should be made to fight back. Maybe even involvement by the entente powers? -Leon
I have some remarks about your Mexico-events:
First of all, Mexico lost its territories above the Rio Grande deep in the 19th century. Is it still realistic for them to claim lands that have been thoroughly Americanized since then? California especially would be very unlikely to be incorporated into Mexico.
Second, Mexico is a syndicalist state in the Mod, with a small chance of some generals couping the government. Wouldn't some events for Mexico to join the war on the CSA's side make more sense than independent action?