It didn't. The real objective of the Mexican-American War (1846-1848) was the forced acquisition of California and its riches; Arizona and New Mexico just stood in the way for such acquisition, and the border skirmishes between Texas and Mexico were the perfect pretext for such conflict.
Because New Mexico had U.S. people and towns in it
As a result of the Mexican American War of 1846-1848.
Most of present-day Mexico and the southern regions of Arizona and New Mexico, which were later acquired by the US on the Gadsden Purchase.
The Mexican American War which was brought about by Mexico's resistance to the US Annexation of Texas and ended with Mexico's surrender and Cession in the Treaty of Guadalupe Hidalgo.
Brigadier General Stephen W. Kearny led an army of 1,700 soldiers into Santa Fe to claim it and the New Mexico Territory for the United States. The Mexican military forces in New Mexico retreated to Mexico without fighting and Kearny's forces easily took control of New Mexico.
they wanted to build a railroad route though the area
New Mexico in 1912.
You may be referring to New Mexico.
New Mexico. Mexico is a country bordering the United States and New Mexico, a state in the the United States, has the same name. The only state in the US that has the name of a country that borders the US in it is New Mexico. The other country is Mexico.
New Mexico, and the rest of the continental US, is in the Western Hemisphere. Since the US is north of the equator, New Mexico is also in the Northern Hemisphere.
The USA, has aways tried to control Mexico, from Pointset, to Pascual, they have always interfere in our business's, but it is actually our fault to let an alien Country to try to control us. l
New Mexico became the 47th US State.