1. On January 4, 1864, President Abraham Lincoln signed the Arizona Organic Act, which officially established the territory of Arizona. This act specified the rules and regulations for the governance of the territory, laying the foundations for Arizona's eventual statehood in 1912.

2. John Jacob Astor IV, the wealthiest passenger on board the Titanic, was born on January 4, 1864, in Rhinebeck, New York. Although he had no direct ties to Arizona, Astor did invest in mining ventures across the western United States, including in Arizona's Copper Basin.

3. January 4, 1916, saw the formation of the Arizona Highway Department, which was responsible for the construction and maintenance of the state's growing network of roads. Today, the department operates as the Arizona Department of Transportation and oversees a network of highways that stretches over 6,700 miles.

4. On January 4, 1935, the city of Tucson received its first direct telephone connection with Mexico when the transcontinental and Western Air Inc. established a direct link with the city of Hermosillo in the Mexican state of Sonora.Thus, the communication became easy.

5. January 4, 1990, marked a tragic day in Arizona history when an avalanche in the San Francisco Peaks near Flagstaff took the lives of six young men. The group was part of a larger party of snowboarders exploring the backcountry when the avalanche struck, highlighting the dangers of winter sports in Arizona's mountainous terrain.