WI: The treaty of Guadalupe Hidalgo isn't accepted.

So the Treaty of Guadalupe Hidalgo, ended the Mexican-American war, but it wasn't really what Polk wanted or expected to happen. Let's say Polk doesn't accept it, what happens next?
 
Trist is fired, a new negotiator is sent, and Mexico probably gets a decent amount more money, but the border goes quite a bit further south.
 
Trist was fired but contuied on regardless.

I just like mentioning it. He deserved more than that. :p

If I remember correctly, Congress had also agreed upon Polk’s goals and had given the OK for that amount of land to be annexed, too. Therefore the biggest roadblock to getting a treaty renegotiated would be the Mexican delegation. But as they were already in a poor position, the prospect of additional money for the remainder of the desired land might be good enough.
 
Actually an attempt to force Mexico to give up more land led by Jefferson Davis were defeated by a large margin.
 
The more land The United States swallows up from Mexico, the more Mexicans it swallows up with it, and considering the 19th century US's track record of treating brown people, expect things to get ugly really fast.

Realistically speaking, OTL plus some extra bits was about as much as the US could handle, anything like Polk's silly dreams of annexing anything south of the Rio Grande would unwind into a bloody fiasco within a couple of years. Once the Civil War breaks out, expect the Mexicans in these extra territories to rebel, assuming they actually decide to wait for the South to secede first.
 
The more land The United States swallows up from Mexico, the more Mexicans it swallows up with it, and considering the 19th century US's track record of treating brown people, expect things to get ugly really fast.

Realistically speaking, OTL plus some extra bits was about as much as the US could handle, anything like Polk's silly dreams of annexing anything south of the Rio Grande would unwind into a bloody fiasco within a couple of years. Once the Civil War breaks out, expect the Mexicans in these extra territories to rebel, assuming they actually decide to wait for the South to secede first.

More racial trouble I can see, but the Mexicans seceding? I doubt it.....if anything, those who hadn't left for what's left of Mexico would actually likely side with the Union.
 
Realistically speaking, OTL plus some extra bits was about as much as the US could handle, anything like Polk's silly dreams of annexing anything south of the Rio Grande would unwind into a bloody fiasco within a couple of years. Once the Civil War breaks out, expect the Mexicans in these extra territories to rebel, assuming they actually decide to wait for the South to secede first.
What's to say they will have any greater success than the Confederates?
 
What's to say they will have any greater success than the Confederates?

Well for one, they're more likely to get international support, not being slavers. Second, until recently they would have been part of Mexico, so this isn't a nation declaring independence but rather lost provinces forcefully rejoining their homeland. If Britain supports the Mexican territories bid for independence, then the US will have no choice but to accept. After all, Britain could blockade the major US ports, bomb their coastal cities and more or less bring all Atlantic trade to a screeching halt.
 
In terms of internal US politics, Polk really had no choice but to accept. As I once noted in soc.history.what-if,

***

When Polk got the terms of the Trist *projet* in February 1848 he did not
like what he saw--the terms reflected not the current military situation but
one of many months earlier (not to mention the irregular way they had been
arrived at). Nevertheless, even before meeting with the Cabinet, Polk
concluded that the *projet* must be accepted. It fell clearly within the
limits of the original instructions to Trist--except for Baja California and
the Tehuantepec right of transit, neither of which Polk had regarded as a
*sine qua non.* If Polk refused it, this would just seem to confirm the
charges of the Whigs (and of some Democrats) that the war had been begun and
was being continued to conquer and annex All Mexico. Moreover, the Whigs
controlled the House of Representatives, and Polk worried that they might
refuse to vote any more men or money for the war. The Army would then have to
be withdrawn, and if the Whigs came to power in the next presidential
election, even California and New Mexico might be lost. Even if the House
was willing to fund the war, continuing the war might require doing away with
the Walker Tariff's low rates and returning to Whig high-tariff policies
(which even some Democrats, especially Pennsylvanians like Buchanan and
Dallas, might favor). Most frightening of all, the Wilmot Proviso was
gaining favor among Northern Democrats, and a continuation of the war might
mean that the slavery issue would disrupt the Democratic party--and then the
Union.

Polk gathered the Cabinet together, but made it clear that whatever they
thought (and Buchanan was very unhappy) he was going to submit the treaty to
the Senate. "He would himself, he said, have preferred to acquire more
territory, *perhaps to the Sierra Madres.* [my emphasis--DT] But he doubted
whether the Mexicans would ever have agreed to this...[and] feared that the
American public, which was aware of the *projet*, would not sustain the
Administration in rejecting it." Merk, *Manifest Destiny and Mission in
American History*, p. 186.

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