Earliest Mormon-style trek?

Inspired by the "Earliest North American Crossing" thread, what would be the earliest date for a plausible Mormon style expedition to the west? One large enough to set up an independent colony like the Saints did in Utah.
 
The persecution of the Saints in Missouri in the late 1830's was fairly severe. Perhaps if Illinois had not allowed them to settle Nauvoo, it could have led the leaders of the church to go west (mind you that it would be Mexico at the time). So perhaps 1839-1840 would be the earliest it would happen and depending on the out come of the Mexican-American War(if not butterflied away), they may or may not end up living in Mexico/Oregon (which is contest with the British in OTL)
 

Skallagrim

Banned
Wasn't most Mexican territory in the far north claimed in name only? No actual Mexicans were living there, at least not inland. Political control was hypothetical. Americans moving into Texas were opposed, but people moving into the OTL's Utah (whatever it might be named in this ATL) would be relatively free to do so.

Oregon was much the same. In the OTL, oth British and American citizens moved there. If Moromons or some other group moved all the way west into Oregon, the British would hardly be in a position to stop them. The presence of more Americas might even weaken the British claim, leading to all Oregon being entirely American later on.
 
Wasn't most Mexican territory in the far north claimed in name only? No actual Mexicans were living there, at least not inland. Political control was hypothetical. Americans moving into Texas were opposed, but people moving into the OTL's Utah (whatever it might be named in this ATL) would be relatively free to do so.

Yes - Spanish-speaking settlements were mainly in parts of New Mexico and along the California coast. Even there, many of these settlers didn't identify as "Mexican" but as Hispanos, Californios or similar; they generally did not feel that much allegiance to the government in Mexico City.
 
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