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Originally Mexico spanned from Oregon and Kansas south to Costa Rica, with even some good legal claims on Cuba that could have been used in the future. And even on Louisiana if they won a war with the USA that entire literally opposite of OTL. But not only did Central America leave early on, but Chiapas/Los Altos, Yucatan, Tejas, Republic of Rio Grande, California, New Mexico, and Sonora all had multiple independence movements.

So what needs to be done and when to keep Central America and other parts from constantly pushing against Federalism and staying together (which I assume would have presented a stronger army and national consciousness against the US in the 1830s and 40s.
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