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Suppose the governments of the Great powers get scared in July 1914. Serbia makes embarrassing concessions and Austra/ Hungary decides it does not need a war.
How long will the Austrian, Ottoman and Russian empires survive?
What will happen to social progress for women and for ethnic minorities?
How bad would Ireland get?
(I write this believing that WW1 was the key cause of both Lenninism and and Hitler taking power both of which were catastrophic for humanity)