Interesting question. We do know there were (and still are today) Mormon settlements in Mexico. When they arrived is something I do not know.Excluding Texas + California, were there American settlers in Mexico in the early 19th century?
If so, where exactly did they settle, what were their numbers, and what were their occupations?
Basically, the context of this question is that I know that some Americans settled in both Texas and California back when they were still a part of Mexico--thus making possible both the 1836 Texan War of Independence and the 1846 Bear Flag Revolt--and was thus wondering if any other parts of Mexico likewise had American settlers in the early 19th century.