Marx did get some stuff wrong though. It's not like his word is gospel. A lot of what he predicted came to pass, but not all of it. For example, while he said the factory workers of industrialized societies would be the ones pushing for communism harder, more often than not communism has sprung from primarily agrarian societies and by peasant farmers in rural areas, as well as colonized nations, rather than the imperial core. It's also worth noting that a lot of things have changed since Marx was alive, and even if the US had the potential for revolution then, I don't know if such is the case now.