Oh, hell, WWI was a family feud. Nicky and Willy were in a tiff because Joe invaded Serbia, but Cousin Ed got into it because of some deal with the frogs over Willy fighting with Nicky. Damned thing could have been solved without fighting if they'd talked together in the first place (see Keegan's "World War I").

If the "winners" of WWI hadn't wanted "reparations" from Willy's gang WWII might not have happened at all.

By the way, Germany never formally surrendered after WWI. There was an Armistice, but no surrender.