1. On July 23, 1902, the state of Minnesota declared a statewide quarantine due to an outbreak of scarlet fever. The quarantine lasted for several months and required schools to be closed and public gatherings to be canceled in order to prevent the spread of the disease.

2. On July 23, 1912, the first long-distance telephone call in Minnesota was made between Minneapolis and Butte, Montana. The call was made possible by the newly completed transcontinental telephone line and marked a major milestone in communication technology.

3. On July 23, 1921, the town of Hibbing, Minnesota was hit by a devastating tornado that killed 37 people and caused extensive damage to buildings and infrastructure. The tornado remains one of the deadliest in Minnesota history.

4. On July 23, 1966, the historic riverfront district in Minneapolis was officially designated as a National Historic Landmark. The district includes many of the city's oldest buildings and was an important center of commerce and industry in the late 19th and early 20th centuries.

5. On July 23, 1984, the Minnesota Twins played their first game in the newly constructed Hubert H. Humphrey Metrodome. The stadium, which was known for its distinctive inflatable roof, served as the Twins' home field until 2009 and hosted many memorable moments in Minnesota sports history.