1. In 1867, the Nebraska Legislature passed a bill to create a new county in the northeastern part of the state. The county was named after the French explorer Pierre Le Sueur and officially established on May 25th of that year.

2. On May 25, 1932, the city of Kearney experienced one of the worst tornadoes in Nebraska's history. The tornado was rated an F4 on the Fujita scale and caused significant damage to the city's downtown area, destroying many buildings and killing two people.

3. In 1946, the Omaha Stockyards held one of the largest hog sales in their history on May 25th. Over 48,000 hogs were sold that day, with some weighing as much as 800 pounds. The sale set a record for the highest single-day sales volume in the history of the stockyards.

4. On May 25, 1953, the United States Air Force Strategic Air Command established its first operational base in Nebraska. The base, located near Omaha, became known as Offutt Air Force Base and played a pivotal role in military operations during the Cold War.

5. In 1986, Nebraska Governor Bob Kerrey signed a law establishing the state's first official mammal on May 25th. The mammal, the white-tailed deer, was chosen for its importance to the state's wildlife ecology and its popularity among hunters and outdoor enthusiasts.