User blog comment:KawaiiUnicorn/Kawaii's AKA (I'm jumping on the bandwagon)/@comment-5188557-20151028165306/@comment-35538124-20151029213557

I'd have to say interwar years and WW2 (1920s-1940s).

A lot of gobal changes and economic and technalogical advances were taking place. (Plus Finland kicked Russia's ass :P)