1. The Treaty of Guadalupe Hidalgo was ratified on July 10, 1848, officially ending the Mexican-American War and ceding a large portion of what is now New Mexico to the United States.
2. On July 10, 1954, the first atomic bomb test was conducted at the White Sands Proving Ground in New Mexico. The test was part of Operation Castle, a series of high-yield nuclear weapon tests.
3. In 1933, the University of New Mexico officially accepted its first African American student, Clarence F. Smith, on July 10.
4. The Albuquerque International Balloon Fiesta, the world's largest hot air balloon festival, announced its first annual event on July 10, 1972.
5. On July 10, 1962, New Mexico's Carlsbad Caverns was designated a UNESCO World Heritage Site, recognizing the unique and delicate cave formations found within.