The keyword phrase "patriots day us" functions as a proper noun. The core of the phrase, "Patriots' Day," is the specific name of a holiday. The addition of "us" serves as a postpositive adjective or a specifier, clarifying that the subject is the holiday as observed in the United States. Therefore, the entire phrase identifies a unique entity.
As a proper noun, the term refers to the American civic holiday observed on the third Monday of April in Massachusetts, Maine, and, unofficially, in several other states like Connecticut and Wisconsin. It commemorates the anniversary of the Battles of Lexington and Concord and the Siege of Boston, the first military engagements of the American Revolutionary War on April 19, 1775. The holiday is marked by historical reenactments, parades, and most notably, the running of the Boston Marathon, which has been held on Patriots' Day every year since 1897 (with exceptions for cancellations or date changes).
Understanding that the keyword is a proper noun is crucial for structuring an article, as it establishes the main subject as a specific event. The article's focus should be informational and descriptive, centered on defining the holiday, detailing its historical significance, explaining its modern observances, and exploring its cultural impact. The grammatical classification dictates that the content's purpose is to explain this particular entity, rather than to describe a quality (adjective) or an action (verb).
