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Some limited interaction surely occured between explorers and Mountain Men in some form prior to 1800. Trappers like Kit Carson were sufficiently familiar with Southern California, New Mexico and present day Arizona to be of great value to the US Army during the California Campaign of the Mexican American War. A formal relationship was created as the result of the Treaty of Guadalupe Hidalgo which ended that conflict in 1848.

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13y ago

In 1848 under the Treaty of Guadalupe Hidalgo with Mexico.

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