The US- Mexico border was formally established in 1848. The border separated and reclassified the indigenous Natives of the Americas into two separate groups and classifications; the now known as indigenous Native Indians of US and the now known indigenous Native Mexicans of Mexico, eliminating the Americas and alluding an ideological representation of two different people and two different places. Prior to 1848, indigenous Natives of the Americas flowed somewhat seamlessly through one physical space as one physical indigenous group of people of the Americas.
Most significant dates that transformed life for indigenous Natives of the Americas and along the US-Mexico border to present day.
1848
Guadalupe-Hildago Treaty, ending the Mexican, American war, establish that Mexico ceded 55% of its northern territories to United States, and relinquished its claims to Texas. It altered the boundaries between the U.S. and Mexico, and establish the division between both countries, as we now know it.
1849
The Treaty of Guadalupe Hidalgo establish the Mexican-United States boundary commission to survey and mark the boundaries between the countries. They established the line from the Pacific Ocean to the junction of the Gila and Colorado rivers in present day New Mexico and Arizona.
1855
The Mexican-United States Boundary commission finished its work in 1855 and the border now had obelisks monuments separating the two countries.