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.
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