Wikipedia's article on Trotskyism said:Lenin's outlook had always been that the Russian revolution would need to stimulate a Socialist revolution in western Europe in order that this European socialist society would then come to the aid of the Russian revolution and enable Russia to advance towards socialism. Lenin stated:
“ We have stressed in a good many written works, in all our public utterances, and in all our statements in the press that... the socialist revolution can triumph only on two conditions. First, if it is given timely support by a socialist revolution in one or several advanced countries. ”— Lenin, Speech at Tenth Congress of the RCP(B)
What if the West did experience a revolution? A possible POD for this could be that WW1 lasts until the 20's and results in the complete social economic collapse of Europe, in the ensuing chaos, Communists take over and join Europe with the Soviet Russia resulting in a Europe-wide Soviet Union. How would Communism work out if this had happened?