It’s difficult to quantify, but I think there is a compelling argument to be made - just off of my head, WW2 led to:
- the fall of German autocracy/restoration of German democracy (though Hitler did kinda break that one in the first place)
- Italian and Japanese democracy
- redistribution of wealth/power in Britain
- the 4th french republic
- alignment of the European democracies
- establishment of the UN
Eastern Europe is not real
Not in, like, the “there’s nothing there” way, but in the “there’s no substantive economic, social or geographic reasons to treat it as a cohesive region” way