DBWI- What if the U.S went to war with Mexico?

In 1845 President James K Polk made clear his imperialistic ambitions for a United States that stretched from the Atlantic to the Pacific. Thankfully sanity (and the whig party) prevailed and that period of near war with Mexico was smoothed over gently. So what if the U.S and Mexico actually went to war? Who would've won? What concessions would be forced on the loser?
 

Deleted member 97083

Mexico was politically unified under its president, had a larger army, was on the defensive terrain very far away from American logistics and had European support (who would be interested in keeping the Balance of power). Not sure how the Americans could win decisively here.
Plus James Polk's Pacific ambition was mainly focused on the Oregon Territory and Columbia, which he got... not to mention the thin border strip, the Jefferson purchase, to allow a railroad to Oregon. So why would he even want to attack Mexico?

Why would he even want the Gran Lago Salado territory or the southern two thirds of Alta California, or any piece of Nuevo Mexico? Why jeopardize the relationship between the Mexican Presidency and the United States of North America, just for a strip of desert, which was not yet known to be mineral-rich?

Now if a small scale war broke out in the Jefferson Territory due to the Gold Rush on the US Mexico border, that I could understand. But that's 10-15 years after Polk. And that was skillfully defused by Archbishop Santa Anna and Ambassador Abraham Lincoln, so you have to get rid of those two figures for war to break out.

Truly it would require something ridiculous like Mexico allowing Americans to settle Tejas or something.
 
Did Mexico had a fleet? Because America had and they could invade from the Gulf.

Also those territories in Northern Mexico are really difficult to attack AND defend, as we saw during the war between Mexico and the Southern Rebels.
 

Deleted member 97083

Did Mexico had a fleet? Because America had and they could invade from the Gulf.

Also those territories in Northern Mexico are really difficult to attack AND defend, as we saw during the war between Mexico and the Southern Rebels.
True, but the Mexican army was tied up in the French invasion of the Federal Republic of Central America and the quelling of the second Maya rebellion.

Robert E. Lee was only able to occupy northern Tejas because of his alliance with the Comanche and Mexico being distracted. If Mexico had been at peace during the Rebel raids, the Gray Army wouldn't have lasted a week.
 
We need to give them an aim - as it stands, things were settled peacefully with Mexico, with Mexico consenting to the USA annexing Texas, and eventually selling everything North of the 37th Parallel to the USA. We got a nice, neat border and another great Pacific harbor, and Mexico got a much needed injection of capital. Why would we want to fight a war over the deserts of Mexico's Northwest, especially as we were still integrating gains from the Columbia Treaty with Britain?
 
I just realized the massive butterflies my scenario could cause.
We might not even have the North American Union today.
 
OoC: It's been established Texas remained part of Mexico at least long enough to have Robert E. Lee occupy the northern part of it, so I assume the 1860s
 
OoC: It's been established Texas remained part of Mexico at least long enough to have Robert E. Lee occupy the northern part of it, so I assume the 1860s
OOC- Probably although since Lee's rapid promotion was due to an outstanding performance in the Mexican American war he may of taken longer to become a general.
 
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