AMERICAN cultural heritage started about 10,000 years ago when the first people came here, everyone after that just added to it.
why are europeans so jealous of USA that they have to always try to put it down?
BTW , there is no american empire, you euros tried to rule the world and failed (nice "cultural heritage" there europe) , the US does not want to rule the world, but you euros think the USA wants to be like you were.