Today, it's the American proletariat's turn to support it (and if the USA were socialist, it could _far better_ support Cuba & whatever nation on the periphery that wanted to get socialism going than the poor old USSR could), but Americans are not rising up to the occasion. :(
I think that, _morally speaking_, we in the belly of the beast _owe_ it to the rest of the world to build socialism here first of all & help others make a transition to socialism. Morality, however, has never been the motor force of history. _Might makes right_ -- hence the necessity of state power, from which American socialists, alas, stand _very, very far_, objectively & subjectively.
Yoshie