Creativity generates culture.
The primary reason the United States is the world’s cultural hegemon is because it has a diverse population in which to mash unique ideas.
Combine this recipe on top of plentiful tools for experimentation, production and distribution supported by established marketing practices to help spread the word. Taken together, these elements are what political scientist Joseph Nye coined American soft power.
Global culture and American culture are often considered the same thing.
From music to business, America is constantly pushing new stuff in which people assimilate. Even imports into America like Psy’s “Gangnam Style” get recasted as American and spit back out into the world. What is Korean pop is also American pop. America is the remix nation.
But even remixes get stodgy; the hodgepodge won’t last forever unless America’s traditional economic and military powers remain.