This was my very first playthrough where I was "winning"! (excl. games where I played with commands)
After winning the civil war and switching to communism, I invaded Canada relatively quickly, with the british only holding out on an island (think it's called Newfoundland but I might be wrong). I joined the Comintern and helped the Soviets push the Germans out. Casualties were not great for me and especially not for the Soviets, but we managed to capitulate them and the Italians, and the Soviets puppeted and took over much of Eastern Europe and the entirety of Germany. Strangely, the Brits fought to make two states of Germany independent, not sure why.
I was still at war with the Allies since I invaded Canada, so after the Axis capitulated, I helped take out British Italy and France. I had to fight the Spanish as well since they joined the east asian co-prosperity sphere for whatever reason. Also, did I mention I was at war with Japan? I don't even know how that happened, but here I am. I also tried naval invading Greenland, but that failed.
So what now? Well, I needed to capitulate the Allies. France is dead so that means I only need to take London, right? Nope, Turkey and Chile are majors this late in the game, so I had to help the Soviets cross the Bosphorus and capitulate the Turks. Unfortunately, the Soviets lost Turkey (but still hold onto Istanbul, meaning they're still "capitulated") so I'll have to intervene. The Soviets were constantly naval invaded in France, Italy, and Iberia, so I had to help them out a bunch. Very annoying. Interestingly, at some point the Soviets were able to capitulate the British Raj with Iran.
Then I had to capitulate Chile. I did my focus to enforce the Monroe Doctrine to get a bunch of war goals on Latin America and pushed downwards. A lot of them joined the Allies so they didn't become puppets. Interestingly, after I took Mexico, Japan invaded the Yucatan so I had to deal with that (El Salvador joined the co-prosperity sphere I think). The only countries that did not join the Allies and became puppets were Guatemala (and they also expanded into Honduras and El Salvador) and Nicaragua (which expanded up to Panama). I crossed Panama and continued pushing through Columbia, Ecuador, Peru, and then I got to Chile and Argentina.
I used pretty much my entire army (that wasn't in Europe saving Stalin) to push so it was pretty easy. I quickly capitulated the Chileans and the Argentinians put up more of a fight but I was able to brute-force towards Buenos Aires. Meanwhile, a part of my army had to go deal with a british invasion (liberation really) of Canada. After that was dealt with, I quickly took out Bolivia and Uruguay because I happened to have the war goals. I didn't have enough war score to puppet all of Bolivia so now there is two. I am in the midst of invading Paraguay, but they are putting up a really good fight. Maybe my army is tired after conquering half of south america. I had to give Alaska to the Soviets as I really didn't want them to get a war goal on me (Europe is under Soviet control)
By this point, the Soviets have had many incursions into Iberia, Italy, and France that I had to go deal with. Most of that is sorted now. Turkey will be a pain to invade again. But the only major left is the British, so I need to work on gaining naval supremacy and doing that. Then I'll FINALLY be done with the war against the allies...but I also need to go take out both Japan and China (I'm at war with both of them for some reason...not sure why)