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So in the timeline I am working on, the US establishes various Client States in Northern Mexico following the American Civil War [I find this to be vastly more realistic than the US annexing these regions, which is also done to death].

They establish two nations; the Republic of the Rio Grande [OTL Coahuila, Nuevo Leon and Tamaulipas] and the Confederation of North Mexican States [OTL Durango, Chihuahua, Sonora and Sinaloa]. The latter of these eventually dividing into Durango, Chihuahua and Sonora [Sonora and Sinaloa]. While the divisions for the Rio Grande Nation are fairly easy to conceive [three states of their former Mexican states], the other three are a little difficult.

I understand that Mexico does have second level subdivisions, but I am unaware if they are important, or arbitrary [Like those of Alberta or Saskatchewan]. Are there any notable divisions that could be extrapolated from the states of Sonora/Sinaloa, Durango, and Chihuahua?
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