1950 Cuba

Don't play as Cuba is the best guide I can give you. Theoretically coudl Cuba be a great rushing nation since you're right in front of the USA and not far from Europe.

So you will want to put your best tank general on heavy tank and your best artillery gen on artillery start with paradroping near USA cities send heavy tank to closest USA city and artillery to Mexico and normal tank to south America and your ship needs to be put one block to the southeast in the first turn. Next take both USA cities and get ready to defend against Patton, take the capital in south America don't move your ship until you defeat USA fleet units which will come from Africa after you defeat Patton take Washington and NY and defeat brasil after that send some units to Africa, Japan and Europe after that you just conquer the rest of the world. Should be able to do it in 60 turns. The north America is the hardest part and if you have more than 2 good generals it's fast too.

Maybe somebody can add something and add it as tutorial in tutorial page.

Which generals do you have and what is your tech lvl

It's hard to do that right now but you should have 2 really good generals for this one as you don't have supertank nor rocket artillery at begging