1. On September 23, 1846, the Mexican-American War came to an end in New Mexico when American troops under the leadership of General Stephen W. Kearny seized control of the territory. This event marked the beginning of a new chapter in New Mexico's history as a part of the United States.

2. On September 23, 1879, the University of New Mexico was established in Albuquerque. The school started out as a small liberal arts college with only two faculty members and an initial enrollment of just over 30 students. Today, the university has grown into a major research institution with a student body of over 25,000.

3. September 23, 1921, marked the first day of operation for the Henry W. Coe Refinery in Artesia, New Mexico. This refinery was one of the first in the state and played a significant role in the development of New Mexico's oil industry.

4. On September 23, 1950, the first television station in New Mexico, KOB-TV, began broadcasting in Albuquerque. The station was a pioneer in local television programming and helped to shape the way New Mexicans received news and entertainment.

5. Finally, on September 23, 2009, a small airplane crashed near the town of Deming, New Mexico, killing all four people on board. The crash was a tragic reminder of the risks associated with air travel, but it also demonstrated the bravery and professionalism of New Mexico's first responders who helped to contain the wreckage and investigate the cause of the accident.