And almost every example of vaguely democratic societies in history were destroyed or altered too, until about the 19th/20th centuries. I don't really support capital C Communism, pretty much for the same reasons I don't support capital C Capitalism actually since they're ridiculously naive utopic visions of an eventually perfect anarchy where everything will somehow just work out for the best(though atleast communism looks at the state of nature and says, "That's shit, we can do better" whereas capitalism looks at it and says "Meh, let's pretty much accept it..."), but pointing to the relatively tiny handful, given all of human history, of attempts to create it all of which occured agaisnt the backdrop of an existing world order extremely hostile to the idea by the way and saying "Well they didn't work, therefore in no circumstances is it ever possible for it to work" is not really the greatest of arguments.
But why then did the surviving Marxian socialist states regress to capitalism if Marxian socialism is superior to capitalism? I'm not questioning the principle of doing away with or reforming capitalism, or coming up with other alternatives to it, I'm questioning this particular alternative to it, and why it has failed without exception: annexation or no annexation.