So this one might be a bit tricky, how do you get an independent Taiwan when the Nationalists win the Chinese civil war on the mainland? It can't be communist, so no just having a reverse of our timeline, but you can have China split with a northern communist part if that helps at all. Whilst this is in After 1900 since that's what I was originally thinking about it's not a hard and fast limit so pre-1900 points of divergence would work as well.