* Grandiosity and Iconic Nature: The sheer scale and artistic vision of the monument, featuring four presidents, inherently lent itself to symbolic representation. Its size and intricate carvings made it a breathtaking landmark, drawing visitors from across the globe.
* Nationalist Sentiment: The sculpture was conceived and built during a period of intense American nationalism, following World War I. It was meant to celebrate American history and ideals.
* Promotion and Media Coverage: The project was extensively promoted through media, particularly in the early 20th century. The construction and its progress were heavily covered, further solidifying the mountain's image.
* Tourist Destination: Mount Rushmore became a major tourist attraction, further increasing its visibility and association with America.
* Cultural Representations: The monument has been featured in numerous movies, TV shows, and other cultural representations, solidifying its status as a symbol of the US.
While not officially declared a national symbol, Mount Rushmore has organically become a significant symbol of American history, power, and heritage through its captivating presence and cultural influence.