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In simple words, Unlike WWI, which was battled in trench with machine weapons as well as biological weapons, WWII was conducted with modern weapons and equipment, with more aircraft, warships, vehicles, and submarine. During the war, special operations techniques, as well as atomic weapons and covert communications, were created.
The assembly line would be my first choice.
Lead the rise of Totalitarianism, which left Europe in small parts and Germany and Italy was not happy about that so they had grown their armies, which led the rise of World War. <span />
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As a result, Chinese religion is based on the veneration of ancestors. Ancestors are thought to be a link to Tian's supreme power because they are thought to be embodiments or reproducers of Heaven's creative order.