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Everything. The creation of Israel (largely as the world reacted to the horrors of the Holocaust). The creation of Atomic weapons. The use of total war upon each other. The damage and/or total loss of cities (not just Hiroshima and Nagasaki, but also Tokyo firebombings, Stalingrad, Dresden, Nanking, Manila). The creation of rockets (V2, which directly led to Space technology). The creation of cruise missiles (V1). The creation of Aircraft Carriers. The rise of propaganda around the world. The rise of ideology associated with that propaganda (Capitalism, Fascism, and Communism). Fascism mostly died out but Capitalism / Communism grew stronger after the war. WW1, the "great war", was thought to be the defining moment of the 1900s. Instead, an even greater and bigger war was fought that almost completely overshadowed WW1. ----------- After the war, when peace was finally established, everyone shared in the pain and loss associated with the war. |
Huh? Total war was the standard practice for millennia.