1. 1846: The Battle of Cinco de Mayo in Santa Fe, New Mexico marked the end of the Mexican-American War in the region. The American forces, led by General Stephen Watts Kearny, defeated Mexican forces who were attempting to reclaim the territory.

2. 1882: The Las Vegas Daily Optic newspaper was first published in Las Vegas, New Mexico. It was one of the earliest newspapers in the state and covered news in the region including politics, business, and agriculture.

3. 1915: The town of Deming, New Mexico was incorporated. Located in the southwestern part of the state, it has a rich history in the mining industry and is home to the Deming Luna Mimbres Museum, which showcases regional history and art.

4. 1945: The United States military conducted a test of the first atomic bomb at the Trinity Site near Alamogordo, New Mexico. The test marked a major milestone in the development of nuclear weapons and had a lasting impact on global politics and warfare.

5. 2002: The "Bataan Death March" monument was dedicated in Santa Fe, New Mexico. The monument was erected to honor American soldiers who were forced to march 65 miles through the Philippines during World War II. Many of the soldiers died or were subjected to brutal treatment by their Japanese captors.