1. Nebraska became a state: On May 31, 1867, Nebraska was admitted as the 37th state in the United States. Today, May 31 is celebrated as Statehood Day in Nebraska.

2. Omaha stockyards closed: On May 31, 1999, the Omaha Union Stockyards closed permanently after 126 years of operation. At its peak, the stockyards covered 102 acres and employed thousands of workers, making it one of the largest livestock markets in the world.

3. Scotts Bluff National Monument established: On May 31, 1919, Scotts Bluff National Monument was established in western Nebraska. The monument features towering bluffs and breathtaking vistas and attracts visitors from around the world.

4. Jesse James museum opened: On May 31, 1963, the Jesse James museum opened in North Platte, Nebraska. The museum showcases artifacts and exhibits related to the infamous outlaw, who allegedly visited the city in the late 1800s.

5. Otoe-Missouria Indian Tribe recognized: On May 31, 2005, the Otoe-Missouria Indian Tribe of Oklahoma was officially recognized by the federal government. Many members of the tribe have roots in Nebraska, where they were forcibly relocated in the 19th century. Today, the tribe has more than 3,000 enrolled members and its headquarters are located in Red Rock, Oklahoma.