Hey there.!

It's generally unlikely for another person to win after someone consolidates all of Asia and worse if they have some parts of Europe, but you can still try to win by SP according to maximum turns playable (usually 50), though that's only possible if Asia doesn't already lead the game by SP because they'll keep mining even more SP then the rest.
If your a sly fellow you can also try the more cunning approach of bringing Marines across the Pacific into Japan, Korea and China although it generally doesn't work against experienced players if your aim to topple your opponent, but it can at least distract Asia long enough to sidetrack it's invasion of the west and give Europe a breather and some respite. It does however require large early upfront costs to execute such plans with success.
Another thing I liked to do as America in long world games was to create long chains of transports from New York to Lisbon Or even farther ( across the Mediterranean and down to Red Sea near Egypt was my record XD ) in order to transport troops quickly into Europe which can be useful in a war of attrition against Asia but they also require early Investment (preferably before Asia consolidates it's holdings) and takes 7 to 10 turns after reinforcement turn to build at the quickest ( unless you're Blitz) and it's also possible for the transports would simply to be shot down by stealths and in the mean time Europe must hold itself together. Despite the challenges to build one i still find it to be a fun thing to carry out. :lol:
Lastly, there is the more easy but less practical and more luck & hope driven route of simply praying to what ever God/Gods you believe in that your opponent would disconnect from the game long enough for you to win. As silly as it sounds this is a rather popular approach then one you might expect and is used by players of all ranks and classes.

Cheers!
