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(Undated) -- One of the nation's newest holiday's is honored in Iowa. Federal buildings, including Post offices and many state, and local government buildings in Iowa are closed Monday in observance of the Juneteenth holiday. Some private businesses may also be closed in observance. Juneteenth celebrations were held over the weekend around the state and the nation. Juneteenth became a federal holiday when President Biden signed the legislation last year. June 19th marks the day in 1865 when Union soldiers told Black slaves in Texas they were free nearly two-and-a-half years after the Emancipation Proclamation.