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So I have a TL that is mostly worked out in rough, but I just want to get some ideas on my central premise.

The idea is that in 1846 Mexico sends some 500 men into California to enforce federal rule, in the resulting Mexican American War the original American incursion into California is defeated, which has two main butterflies:

1. Is that the British gain more of Oregon territory than IOTL as negotiations stall at the outbreak of war

2. Is that America occupies much of Northen Mexico including Baja California after the 'All Mexico' group gains some press and Polk panders to some of their desires.

I intended to explore American attitudes on admitting the Mexican territories as states, how this would affect the Civil War, and other things of course.

Are these reasonable butterflies? Or are they far fetched? I assume them to be but I am looking for other opinions.
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