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alternatehistory.com
Kaiserreich: Legacy of the Weltkrieg is one of the most popular Alternate History mods in Hearts of Iron III, Darkest Hour, and Hearts of Iron IV. It has a deep an established lore where the central powers emerge victorious with a formal peace treaty occurring in 1921. The game starts with the players in 1936 (at least in the Hearts of Iron IV version that I play in).
The PoD is that Germany does not resume unrestricted submarine warfare (and presumably send the famous telegram), hence the United States stays out of the war. There is a a lot of lore to the Kaiserreich universe, far too much to say in a single thread. To refresh yourselves on the lore, take a look at the Kaiserreich wiki which would explain the universe far better than I ever could: http://kaiserreich.wikia.com/wiki/Timeline_of_World_History_since_1914
Can this route actually lead to a Central Powers victory? Or would it result in a stalemate, or even worse, a prolonged defeat of the Central Powers? You guys decide and discuss it civilly in the comments section.
DISCLAIMER: PLEASE DISCUSS NOTHING BUT THE LORE OF KAISERREICH AND WHETHER IT COULD REALLY HAPPEN. DO NOT GO OFF TOPIC AND DISCUSS CONSPIRACIES OR OTHER OFF-TOPIC THINGS. THIS HAS HAPPENED IN MY OTHER THREADS AND I DO NOT WANT THIS TO HAPPEN HERE!