National Wisconsin Day is observed worldwide on May 29 and February 15 to celebrate Wisconsin's admission as the 30th state to the United States. The May 29 celebration is also known as Wisconsin Statehood Day, commemorating the state's official entry into the Union on May 29, 1848. The event recognizes Wisconsin's rich history, including its early inhabitants, such as Native American tribes and European explorers like Jean Nicolet. The state's economy transitioned from fur trading to lead mining, attracting a diverse population of immigrants, which contributed to its rapid growth. The nickname "Badger State" originates from miners who sought shelter in tunnels, reflecting the state's mining heritage. The observance of National Wisconsin Day was established in 2017 as part of the National State Days project, which highlights U.S. states in the order of their admission to the Union.