Smallest possible Mexico

1840:

General Canales rejects terms of peace offer and continues to fight for independence for Republic of the Rio Grande.

1848:

United States demands Baja California at Treaty of Guadalupe-Hidalgo as well as an independent Republic of the Rio Grande.

Yucatan independence recognized by United States.

1853:

Much larger Gadsen Purchase. US buys all of Sonora State.

1928: After 18-years of war, Mexican Revolution ends in stalemate. Nation is split in two, southern half ruled by Zapata.

1933: Chiapas declares independence from Republic of Southern Mexico after death of Zapata.

1941: Chiapas independence established after 8-year war. Loss of Chiapas allows North Mexico to reabsorb South Mexico. However, several cities (Oaxca and Acapulco) refuse and become San Marino like city states.

End result is a Mexico that looks like this:

mexico_zps959f6e4d.png
 
1840:

General Canales rejects terms of peace offer and continues to fight for independence for Republic of the Rio Grande.

1848:

United States demands Baja California at Treaty of Guadalupe-Hidalgo as well as an independent Republic of the Rio Grande.

Yucatan independence recognized by United States.

1853:

Much larger Gadsen Purchase. US buys all of Sonora State.

1928: After 18-years of war, Mexican Revolution ends in stalemate. Nation is split in two, southern half ruled by Zapata.

1933: Chiapas declares independence from Republic of Southern Mexico after death of Zapata.

1941: Chiapas independence established after 8-year war. Loss of Chiapas allows North Mexico to reabsorb South Mexico. However, several cities (Oaxca and Acapulco) refuse and become San Marino like city states.

If you are really trying to go small, there are still a few things you can eat within this framing.

The Rio Bravo Rep, could also take Zacatecas (it seceded as well) and then just have San Luis Potosi and Durango join it. Have the US take Chihuahua with Sonora, and Tabasco could go with Yucatan.

With some American filibustering, Veracurz is taken later on.
 
Surely there would come a point at which the United States would intervene to maintain some sort of coherent Mexican state, especially in the north. It wouldn't be in the interest of the US to be bordered by a bunch of chaotic tinpot republics.
 
The Yucatan claimed the state of Tabasco as well. (oops, missed your post jycee)

But would the US intervene? No. smaller nations are easier to intimidate or take over. Look at Central America... :( Punitive Expeditions in the North might be Common but the US wouldn't prop up a United Mexico.
 
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