1. The first atomic bomb was tested at Alamogordo on April 26, 1945.
On this day, the United States conducted the first nuclear weapons test as part of the Manhattan Project at Alamogordo, New Mexico. The test, code-named Trinity, was an experimental explosion of the first nuclear bomb, consisting of 6.2 kilograms of plutonium.

2. The city of Las Cruces was founded on April 26, 1849.
Las Cruces is located in Dona Ana County in the southern part of New Mexico. The city was founded by the Mexican-American War veteran, Captain Joseph C. Lea, along the west bank of the Rio Grande, and has a rich history including being a stop on the Butterfield Overland Mail route.

3. The United States officially declared war on Germany on April 26, 1917, launching World War I.

On April 6, 1917, the United States declared war on Germany, thus entering World War I. However, the country waited twenty days to officially declare war, which was done on April 26, 1917.

4. The town of Artesia was incorporated on April 26, 1905.
Artesia is a city located in Eddy County in the southeastern part of New Mexico. It was founded in 1903, and two years later, on April 26, 1905, the town was officially incorporated.

5. On April 26, 1910, New Mexico became a state forest reserve.
On this day, President William Howard Taft set aside part of the Lincoln National Forest, located in south-central New Mexico, as a state forest reserve. The reserve was later renamed the Lincoln National Forest, and today covers over one million acres.