1924: Chiricahua National Monument is established.

Also in 1924: 1,600 motorists are stranded at points of entrance to Arizona because of the embargo on all vehicular traffic due to a hoof and mouth quarantine. The occupants of 115 cars at Needles threaten to overpower Arizona border guards, and Governor Hunt orders the National Guard readied for duty.

1931: Construction begins on an Army Airways Operations Building at Fly Field in Yuma.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.