The keyword phrase "patriots day boston history" functions as a compound noun phrase where the core subject, and therefore the main point of the article, is the noun "history." The other words serve as adjectival modifiers specifying the exact type of history being discussed.
Grammatically, "history" is the head noun of the phrase, establishing the article's primary focus. The term "Patriots' Day," a proper noun, and "Boston," another proper noun, both function as adjectives in this context. They modify the head noun by narrowing its scope. "Patriots' Day" specifies the event, and "Boston" specifies the geographic location. The structure clarifies that the subject is not history in general, but the specific history of a particular holiday in a particular city.
Understanding this grammatical role is critical for developing the article. It establishes that the content must be a historical narrative, focusing on the origins, evolution, and significant past events related to Patriots' Day in Boston. The focus should be on factual accounts, timelines, and the significance of historical occurrences, rather than on contemporary celebrations or general tourist information, which would be the focus if "Patriots' Day" or "Boston" were the head nouns.