1. In 1847, the Mormon Battalion arrived in Tucson, Arizona, on January 23rd. They were the first organized unit of the United States Army to enter the region, and their presence was crucial for the defense of the area against the Apache.

2. January 23, 1871, marks the day when the first territorial legislature of Arizona convened. The session took place in Prescott, and it was the beginning of a new era of government in the young territory.

3. In 1903, Arizona experienced a severe earthquake on January 23rd. The earthquake was centered in the town of Fairbank, south of Tucson, and it caused significant damage to buildings, fences, and trees in the area.

4. January 23, 1912, is a significant date in Arizona's history as it was the day when Arizona became the 48th state of the United States of America, marking its admission to the Union.

5. On January 23, 1963, President John F. Kennedy visited Arizona to dedicate the new Glen Canyon Dam on the Colorado River. The dam was an important landmark for the state, providing hydroelectric power and water for irrigation, among other things.