50
Soviet Union in 1894
(hexbear.net)
Just finished the revolution, which I kind of stumbled myself into, and was able to form the Soviet Union in 1894.
I thought this was pretty early, what year where you all able to get communism to kick off in your saves?
Couldn't tell you 100% how to now since I haven't played Mexico in a while and the military system has changed significantly. Even then, I assume what works for V3 and V2 works here: play defensively and bait American troops into a kill zone with artillery. Early game AI is really bad at managing a prolonged war effort and will fold once they start to bleed, in my experience.