1. On April 22, 1870, the Nebraska State Legislature passed an act officially designating Arbor Day as a holiday. Arbor Day is celebrated annually on the last Friday in April and encourages people to plant and care for trees.

2. In 1889, the University of Nebraska was established by an act of the Nebraska State Legislature. Today, the university is one of the largest higher education institutions in the state and serves more than 26,000 students.

3. On April 22, 1952, the Kearney Air Force Base opened in south-central Nebraska. The base was initially used as a training ground for Air Force pilots and crew members and later served as a strategic missile facility during the Cold War.

4. In 1970, the first Earth Day was celebrated around the country, including in Nebraska. The event was organized to raise awareness about environmental issues and promote sustainable practices.

5. On April 22, 2011, the Nebraska Legislature passed a bill allowing residents to carry concealed weapons. Nebraska became the 41st state to enact a concealed carry law, which allows individuals who have obtained a permit to carry a concealed firearm in public places.