Was the worst battle of the Mexican war fought in today's state of New Mexico?

Yes, the worst battle of the Mexican-American War, known as the Battle of Buena Vista, took place in 1847 near Saltillo, Mexico, but significant battles, such as the Battle of Santa Fe, occurred in today's New Mexico. While Santa Fe was not as large in scale as Buena Vista, it was a critical point of conflict as U.S. forces captured the city, contributing to their overall strategy in the war. Thus, while New Mexico saw important battles, it was not the site of the worst battle in terms of casualties.