With a POD no earlier than 1836, what would be needed to prevent Mexico from losing its war against America in 1846, and thus losing a massive amount of its territory. Is it possible for Britain to intervene in Mexico's favour (with the potential effect of Britain obtaining concessions in Washington Territory, Oregon and British Colombia).
Is this a feasible and realistic outcome? I'm not expecting to see the Mexican army marching through Washington D.C., however, I am trying to see a scenario in which they at least get to keep the status quo (perhaps even conceding Texas). This will have major butterflies in the future, perhaps even butterflying the ACW, or altering its outcome in favor of the CSA.
Thank you for your input.
Regards,
Euromellows