The subject of the inquiry, the proper noun "Patriots' Day," refers to a public holiday that is not exclusive to a single state. While most famously associated with Massachusetts, it is also an official state holiday in Maine and Wisconsin. Additionally, it is recognized through public school observances in Connecticut, and Florida law permits schools to teach about the day's history.
The holiday commemorates the first battles of the American Revolutionary Warthe Battles of Lexington and Concordwhich took place on April 19, 1775. Maine's observance is a direct result of its history as part of Massachusetts until 1820. In Massachusetts and Maine, it is a significant public holiday marked by the closure of schools and state offices. Wisconsin's recognition is different; it is a special observance day for public schools, legally designated to foster education about the historical events rather than a day off from work.
Therefore, while Patriots' Day holds its most prominent cultural and civic status in Massachusetts, its official recognition extends to other states, primarily for historical and educational reasons. The scope of the observance varies by state, ranging from a full public holiday with major events like the Boston Marathon to a day of special instruction within the public school system.