On which date was Grand Canyon National Park established?

• A. February 26, 1919
• B. March 15, 1950
• C. July 4, 1900
• D. January 1, 1880

Answer: (A)

National parks are created by a law passed by Congress and signed by the president, and that moment is the official establishment date. Grand Canyon National Park reached that status on February 26, 1919, when the enabling legislation was enacted and signed into law by President Woodrow Wilson. Before then, the area had been protected as a national monument since 1908, with the National Park Service guiding protection since 1916, but the formal park designation came in 1919. The other dates don’t correspond to the legal creation of the park, so they aren’t correct.