First of all, although all states do have a 21 year old minimum for buying and drinking alcohol, it is not a federal law. This means that each state is free to create its own laws, punishments, and agencies.
Title: Leinster Flag/ Naval Jack. Description: This flag represents one of the four provinces of Ireland, Leinster, whose capital is Dublin. The flag was previously used by the United Irishmen in 1798, Daniel O'Connel's Repeal of the Union campaign in the 1830s and 1840s, and the Irish Republican Brotherhood (IRB).
Arms of De Burgh. The Flag of Ulster is a historic banner used to represent Ulster, one of the four provinces of Ireland. The Red Hand of Ulster is a symbol that is either derived from the O'Neill dynasty, then the most prominent Irish clan in Ulster, or the Dextra Dei of early Christian iconography.