1. On December 6, 1911, Arizona became the 48th state to join the United States. After being a territory for 49 years, Arizona finally gained statehood after a long and contentious struggle for political independence.

2. On December 6, 1982, the world-famous Arizona Biltmore Hotel was added to the National Register of Historic Places. Designed by renowned architect Frank Lloyd Wright, the Biltmore has hosted countless celebrities and politicians over the years, including Marilyn Monroe and Frank Sinatra.

3. December 6, 1875, marks the day that the first train arrived in Phoenix. The railroad had a major impact on the growth and development of the city by providing a means for transportation of goods and people.

4. On December 6, 1939, Arizona State University welcomed its first African American student, a major milestone in the university's history. African American students had previously been excluded from attending the university due to segregation.

5. December 6, 1957, was the date that Phoenix Sky Harbor International Airport opened its doors to the public. Since then, the airport has become one of the busiest in the country and an important hub for air travel in the southwestern United States.