My idea for a TL is that, somehow, the USA enters WW1 in 1914, butterflies lead the Entente to smash against the lines of Germany even worse than IOTl, and a worse Spanish influenza and Russian Civil War are heaped on top of that (maybe civil unrest in the USA as well?). The result is a larger, more powerful, League of Nations. It forms various EU style Unions after the war to manage trade and local matters, each providing a military.
Germany still rises to be a fascist power (as do Japan and Italy), and the USSR is still formed. Germany rises in a similar way to OTL, but eventually makes an "Anti-Internationalist Pact" with the other Axis of OTL and a few others (maybe Spain and some third world and colonial nationalist movements?). They then wage a war against a combined LoN army, with the Unions (particularly the Western European one) becoming more integrated.
After the war the USSR (betrayed as OTL) finds itself faced with an ever uniting world, and a Cold War between the USSR and an emerging world state.
Germany still rises to be a fascist power (as do Japan and Italy), and the USSR is still formed. Germany rises in a similar way to OTL, but eventually makes an "Anti-Internationalist Pact" with the other Axis of OTL and a few others (maybe Spain and some third world and colonial nationalist movements?). They then wage a war against a combined LoN army, with the Unions (particularly the Western European one) becoming more integrated.
After the war the USSR (betrayed as OTL) finds itself faced with an ever uniting world, and a Cold War between the USSR and an emerging world state.