1. May 1, 1598: On this date, Spanish explorer Don Juan de Oñate founded the settlement of San Juan de los Caballeros, which would eventually become the city of Santa Fe. This event marked the beginning of Spanish colonization in the region.

2. May 1, 1848: The Treaty of Guadalupe Hidalgo officially ended the Mexican-American War, ceding New Mexico and other territories to the United States. This event marked the beginning of American control over the region.

3. May 1, 1885: The first train arrived in Santa Fe, marking the completion of the Atchison, Topeka, and Santa Fe Railway through New Mexico. The expansion of the railroad had a significant impact on the state's economy and culture.

4. May 1, 1992: The Navajo Nation and the State of New Mexico signed a historic treaty, settling a land dispute that had been ongoing for over a century. This agreement provided for the return of some lands to the Navajo Nation and established new guidelines for resource management.

5. May Day protests: May 1 has also been a significant date for labor and civil rights movements in New Mexico and across the United States. In recent decades, activists have organized May Day protests in support of immigrants' rights and workers' rights, often drawing large crowds and media attention.