If it was possible, USA will not allow communism anywhere in the world, so that there is noone to challenge Capitalism. But it could not finish communism in Cuba on its borders. Though it succeded in USSR due to the policies of Gorvachov (who later thought that he should not hv gone for prestroika and glasnost), but in China they went for experimentation of combining Communism & Capitalism, as none of the systems is fully capable of solving all the problems of mankind and making them happy.
