1. On September 13, 1846, during the Mexican-American War, General Stephen W. Kearny and his army of 1,700 men entered Santa Fe without a single shot being fired, claiming the city for the United States.

2. On September 13, 1879, the University of New Mexico was founded in Albuquerque as the New Mexico Normal School. It is now a public research university with over 27,000 students.

3. The Hubble Space Telescope captured an image of the "Butterfly Nebula" on September 13, 2009. The nebula, located in the constellation Scorpius, is named for its resemblance to a butterfly.

4. On September 13, 1752, the Gregorian calendar was adopted in Great Britain and its colonies, including New Mexico. This change resulted in the "lost" 11 days between September 2 and 14, 1752.

5. The New Mexico State Fair, one of the largest events in the state, often begins on September 13 or around that date. The annual event features carnival rides, live music, agricultural exhibits, and more.