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If you mean during the Mexican-American War (1846-1848), all 72 battles occurred in Mexico. Note it was an invasion with the aim of acquiring California at all costs, to fulfill the "Manifest Destiny" and increase slave territory.
The Northwest territory, the Louisiana territory, the Texas territory, the New Mexico, California, and Oregon territories, and the Florida territory.
In March of 1862, Confederate and Union forces battled in the New Mexico Territory. In summary, it was a Confederate win, but tactically it was a draw. In general terms, the result was that neither the North or the South had much at stake in the New Mexico Territory.
treaty of guadalupe hidalgo =for A+ students
Treaty of Guadalupe Hidalgo
Counter clockwise:TexasOklahomaColoradoUtahArizona
Alta California was Mexican territory. Alta Calfornia consisted of California, Utah, Nevada, Arizona, and parts of New Mexico.
These three vast expanses of land were known as Territory of New Mexico (Territorio de Nuevo Mexico), Territory of Texas (Territorio de Texas) and Territory of Upper California (Territorio de Alta California). However, these large territories included present-day California, Nevada, Utah, Arizona, New Mexico and Texas, as well as parts of Wyoming, Colorado, Oklahoma and Kansas.
Primarily in Mexico with a western extension into California.
It became the US States of Arizona, California, Nevada, Utah and New Mexico.
The Neuces Strip and the Mexican States of Alta California and Nuevo Mexico.
It also became independent from Spain, as it was considered a territory of Mexico.