1) In 1846, U.S. Army troops under the command of General Stephen Kearny arrived at the Tucson area, marking the beginning of Arizona's territorial period.
2) In 1926, the iconic Wigwam Resort opened in Litchfield Park, offering luxurious accommodations and amenities to visitors from around the world.
3) On June 15, 1954, the Phoenix Primate House at the Phoenix Zoo opened, becoming the first zoo in the country to open a facility specifically for primates.
4) In 1966, the famous Papago Park POW/MIA Memorial was dedicated, honoring American servicemen who were prisoners of war or missing in action during the Vietnam War.
5) The Arizona Diamondbacks baseball team played their first ever game on June 15, 1998, defeating the Colorado Rockies 9-2 at Bank One Ballpark (now Chase Field) in Phoenix.