1854: The Gadsden Purchase — in which the United States purchased almost 30,000 square miles of land in southern Arizona and southwestern New Mexico from Mexico — is ratified and signed by President Franklin Pierce. It became effective June 30, 1854.

1877: Schools in Tucson are closed due to a smallpox epidemic.

1896: A plague sweeps hog farms in the Salt River Valley and 8,000 hogs die in the following three months.

1898: Gov. Myron H. McCord receives official authorization to enlist volunteers for the Rough Riders.

1933: Bandits hold up the Valley Bank at Globe and escape with $34,000.

1934: Six-year-old June Robles is kidnapped as she returns home from Roskruge School, and a note demanding $15,000 ransom for her safe return is delivered to her father, Fernando Robles.

June would be found May 14 shackled in a small cage in the desert, about nine miles outside Tucson. The kidnapping remains the only modern major unsolved abduction in the nation. Read more about it here.

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