USA vs CSA with a reestablished Mexican republic if the United States annexed all of Mexico

Say the US annex Mexico in 1848 and the Civil war still happens in 1861.

How US war against the CSA with Northern Mexico and reestablished Mexican republic in Southern Mexico go
 
Very very implausible that USA would annex whole Mexico when it would cause just more problems than would solve and any American doesn't want large Catholic Spanish speaking area being part of USA.

But if civil war still occurs Unionists might concern only just to CSA and decide that trying take Mexico is not worth of all problems. I think that there has been already long guerilla war before ACW.
 
US gives a bunch of land to Mexico, like maybe all the land they currently have. CSA wants a lot of northern Mexico. CSA gets their ass beat fighting a two front war.
 

JJohnson

Banned
Say the US annex Mexico in 1848 and the Civil war still happens in 1861.

How US war against the CSA with Northern Mexico and reestablished Mexican republic in Southern Mexico go

I'm not entirely sure how to parse this, but I'm assuming you mean:

The US took OTL northern Mexico in the war that ended in 1848, meaning Rio Grande, Sonora, Chihuahua, Baja California, and possibly Durango/Sinaloa.

The remainder of Mexico is a separate nation called "Mexico."

In 1861, after (Rio Grande, Sonora, Chihuahua, Baja California, Alta California, Texas, New Mexico) are already absorbed into the United State, the Civil War happens.

The US and CS fight; the nation of Mexico joins the war.

If they fight on the CS side, I don't think the Union blockade can reach two nations, so both can get supplies from abroad more easily, making their war effort last longer and essentially the CS will win independence.

If they fight on the US side, the Confederates will lose. They don't have the materiel or manpower to fight a two front war. Especially with Jefferson Davis spreading their forces so thin protecting individual states, that many troops just stand idle when they could be used doing something.
 
The US took OTL northern Mexico in the war that ended in 1848, meaning Rio Grande, Sonora, Chihuahua, Baja California, and possibly Durango/Sinaloa.

The remainder of Mexico is a separate nation called "Mexico."

In 1861, after (Rio Grande, Sonora, Chihuahua, Baja California, Alta California, Texas, New Mexico) are already absorbed into the United State, the Civil War happens.

I was talking about the US annexing whole of Mexico in 1848 instead of just the modern South West. Given that Sonora, Chihuahua,and Baja California had low populations in 1848, I assured that it would swamped by Southerns leading to those areas joining the CSA. I also had OTL mexico without Sonora, Chihuahua,and Baja California seceded from the US at the same time as the CSA
 

JJohnson

Banned
All of Mexico might be a very difficult pill to swallow. In that instance, assuming it gets past objections in the Congress (Mexico is majority Catholic, vs. US majority Protestant, Spanish/English, racist sentiments, US slavery vs. Mexico not having it), I'm thinking that like you said, Sonora, Rio Grande, Baja, Chihuahua and north are settled majority Anglos, while the south is more sparsely settled till you can get electricity and AC, leaving it majority ethnic Mexican. In the event of a civil war, I would think this Mexico goes for its own independence, leaving a smaller Mexico and maybe independent Yucatan.
 
I was talking about the US annexing whole of Mexico in 1848 instead of just the modern South West. Given that Sonora, Chihuahua,and Baja California had low populations in 1848, I assured that it would swamped by Southerns leading to those areas joining the CSA. I also had OTL mexico without Sonora, Chihuahua,and Baja California seceded from the US at the same time as the CSA

Sonora and Chihuahua had significant Mexican populations, much more than New Mexico. Same goes for Tamaulipas and other northern Mexican provinces. The land available for slavery isn't too much, and requires disposessing the local Mexicans as well as fighting the American Indians (the Comanche raided deep into Mexico in this time, and the Civil War invigorated them in Texas). Hard to get the region swamped with Southern slave owners. Sonora and Chihuahua will basically be in a state of civil war between pro-Mexican forces and pro-CSA forces and maybe even some Unionist forces. Combine that with the Comanche, Apache, Yaqui, and other indigenous forces, and it will be a mess during those years.
 

Deleted member 67076

Northern Mexico is probably going to fold back into the new Mexican state while the CSA is forced to fight a 2 front war from day 1. As Ive pointed out here, the US annexing all of Mexico means a major economic and population boom for Mexico that will be still in swing during the war. If anything the war might fuel another economic spike as Mexico, like Egypt become major alternatives for cotton production (and most of the fighting is going to be on CSA land, far away from the valuable mining, plantation, and ranching provinces of Mexico, let alone the burgeoning industrial heartland of the valley).
 
Mexicans take the opportunity to rebel and restore their country, possibly with the British supplying arms from Jamaica to Veracruz. If the US tries to blockade it faces the possibility of a three front war that would shatter it.
 
Even in 1895 the Population for Sonora was 192,721 and for Chihuahua was 265,546.

https://en.wikipedia.org/wiki/Chihuahua_(state)#Demography

https://en.wikipedia.org/wiki/Sonora#Demographics

But there's a limited amount of settlers available (especially slave owners), and the Mexican Census can be considered questionable given the actions of the Yaqui (who clearly won't be friends of either Mexicans or Americans, unless they get a favourable treaty which no doubt the Americans will seek to reverse) in the early 20th century. New Mexico, on the Mexican frontier, under American rule had a major Hispanic influence since territorial days which continues into New Mexican statehood.

IOTL Kit Carson was a famous figure in the New Mexico region and helped defeat the CSA in their invasions of New Mexico (a lot of New Mexicans viewed the CSA as nothing but a violent Texan incursion). I have no doubt that Sonora and Chihuahua would declare for the United States (or perhaps even Mexico), and be able to suppress CSA influence there.
 
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