IMO if this were the case, much more of Africa and South America would be socialist, and I believe the entire pacific of Asia would also be socialist including Japan. Once the gap on land in Asia is closed and Africa and South America are liberated, the core would have to shrink again no longer being able to project it's power outside of it's core (western Europe, US, Canada). Then next India and Australia would go, then Greenland, the remainder of South America, and then western Europe, and finally the US and Canada. The order could be wrong, this is just my opinion
I feel like in a world where China, a united Korea, Taiwan, the Philippines, the Soviet Union, and Vietnam are all communist; the Japanese communist party would be radically more successful. Even in our own timeline they almost succeeded, and in this one where all of Japan's major trading partners are communist, and there is no strategic reason for the US to keep a tight leash on them, I don't see why they couldn't also go red.
Same with Indonesia, India/Sri Lanka, Egypt, Libya, and Brazil.
Also a socialist control of the entrance to the Red Sea would instantly make that confederation of countries (Yemen, Somalia, Eritrea, Ethiopia) one of the wealthiest and most influential world powers on this map. Control of that geopolitical area would give those countries an absurd amount of dominance and political power due to them being able to hold hostage a massive percentage international shipping, the oil trade, international trade, and maritime traffic.
How would socialist Mexico even work if it's right next to Amerikkka? It's one of the least likely developing nations in terms of having a successful revolution
Cuba has the classic "English Channel" defense though. Mexico would not have the benefit or luxury of being isolated from America by nearly 100 miles of ocean.
Tbf if this timeline happened America wouldn't have had 30 years to plunder the world unchallenged and it would be much further along its decay path than it already is in THIS timeline