National West Virginia Day is observed in West Virginia on June 20 each year to commemorate the state's admission to the Union in 1863 during the American Civil War. This holiday celebrates the historical significance of West Virginia, which was formed from the northwestern part of Virginia, making it unique as the only state to have seceded from a Confederate state. The holiday has been officially recognized since 1927 and is marked by flag-raising ceremonies and various festivities that honor the state's history and culture. Additionally, an alternative celebration known as National West Virginia Day occurs on March 22, created by National Day Calendar as part of its National State Days project launched in 2017. The observance highlights West Virginia's identity as the Mountain State, reflecting its geographical features and rich heritage.