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/u/xenophontheathenian answered "Why exactly did the Marian reforms of the Roman military cause the loyalties of the soldiers to shift to their generals?"
/u/JustSomeBadAdvice answered "How fierce was the fight over water and electricity becoming utilities"
/u/kieslowskifan answered "Did the Nazis and the Soviets see FDR's New Deal as "socialism"?"
If it's alright for someone to have two nominations, see /u/ragingrage on the noonday demon or how depression and anxiety were seen and treated in the Medieval era.