1. On May 31, 1866, the Milwaukee and St. Paul Railroad Company was incorporated, linking Milwaukee to the Mississippi River and facilitating transportation of goods and people.

2. In 1902, the Milwaukee Electric Railway & Light Company began operating streetcar lines in Wauwatosa, a suburb of Milwaukee, improving transportation options for residents and creating new opportunities for development.

3. On May 31, 1910, a deadly tornado tore through the town of East Greenwich, killing eight and injuring 40. The storm caused extensive damage to the area's homes and businesses.

4. In 1964, the World's Fair opened in New York City, featuring a pavilion showcasing Wisconsin's dairy industry. Known as the "Dairy State Exhibit," it included a 70-foot-long fiberglass cow that visitors could enter and explore.

5. On May 31, 1982, the Milwaukee Bucks won their first NBA playoff game in franchise history, defeating the Philadelphia 76ers 101-96 in the Eastern Conference Finals. The team was led by Hall of Famer Marques Johnson, who scored 25 points in the game.