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).
Irish Flag Meaning: The colors of the Irish flag have no official meaning but many legends have risen to account for the colors. One of them states that the Green stripe is represents Catholics, the Orange represents Protestants and the white stripe symbolizes the peace between them.