This is the Planescape I made in 2016. It's set in 1973, just after the Yom Kippur War.
The core premise is that in 1814, Napoleon Dynamite rediscovered the multiverse. He led the French army into Hyperborea and quickly conquered it. Then he declared himself God-Emperor of Mankind. He's still alive.
The biggest thing that happened since then was the accidental killing of God. Back during the Yom Kippur War, the USAF spotted an unidentified flying object while transporting goods to Israel. A jet shot it down. It turned out to be God. That's how God died during the Yom Kippur War.
Everything is okay now, but doom is coming in the timeline, the Aether Division. The USSR will survive until 1994 because of a Butterfly Effect caused by Big Boss and Venom Snake. When the year 1994 comes around, the Gap happens.