The keyword phrase functions grammatically as a noun phrase. In this structure, "holiday" is the head noun, modified by the proper noun "September 11" acting as an adjective. The prepositional phrase "in the US" further modifies the noun. The core concept this phrase identifies is a misunderstanding: September 11 is not an official federal holiday in the United States. Instead, it is legally designated as Patriot Day, a national day of observance.
The official status was established by law and presidential proclamation. Following the attacks, December 18, 2001, saw the signing of a joint resolution by Congress authorizing the President to designate September 11 of each year as "Patriot Day." In 2009, Congress further named the date a "National Day of Service and Remembrance." Unlike federal holidays, which typically involve the closure of government offices, schools, and many private businesses, this day is a regular workday for most Americans. Observances include a presidential proclamation calling for the U.S. flag to be flown at half-staff and for a moment of silence to be observed at 8:46 AM (EDT), the time the first plane struck the World Trade Center.
The distinction between a day of observance and a federal holiday is intentional and significant. The purpose is to foster solemn remembrance of the nearly 3,000 victims and to honor the first responders and recovery workers. By designating it as a National Day of Service and Remembrance, the U.S. government encourages citizens to engage in charitable service and community activities as a positive and forward-looking tribute. Therefore, using the term "holiday" is factually incorrect and misrepresents the day's somber and reflective purpose.
