Indeed. US seems to be the primary distributor of what we can call "universal culture" - i.e. the things that culturally outcompete other things. It's not even that the US has the best cultural ideas - but being the strongest and relatively free market economy for most of the 20th century let the US import ideas from all around the world, distill them through market competition, and re-export globally as "American".
Indeed, the US pursued cultural export to Europe and Asia very aggressively, as a deliberate, planned policy [3] after the war. E.g. the Marshall plan granted convenient access to American film, pop music, and later on television to the Western European market [1] [2]. After the US built a huge culture industry, it was much easier to maintain momentum.
