I like to put on the Extended Timeline mod for Europa Universalis IV, which is kinda wack, and leave it on Observer mode, just to see how the world will unfurl. I decided to fuck things up a bit, so I started one day before World War I, shattered Russia, and then united it with China and the tiny Indian princedoms that were still under the British Raj's control. Then let it run for a century to see how things would go. This is a world where pretty much everything stayed the same, except Germany is mad beefy and the Central African Republic is a regional power in Africa. This sucked and I'm glad I didn't stay to watch.