World War II was the deadliest military conflict in history in terms of total dead, with some 75 million people casualties including military and civilians, or around 3% of the world's population at the time. Many civilians died because of deliberate genocide, massacres, mass-bombings, disease, and starvation.
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The rise of nationalism
The desire for national self-rule
The desire to unify territories
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Both Japan and Germany had a superiority complex. They think they are racially physically mentally culturally and militarily superior to others. It was there biggest negative as they were so much filled with their alter egos that they actually made foolish decision in war to satisfy their ego.
Both Japan and Germany were fighting war on multiple fronts. It was a strategic nightmare. Germany was fighting in Africa, Western front and Eastern front simultaneously. Japan was fighting in China, the Philippines Myanmar, Indonesia and Malaysia simultaneously.
Both Germany and Japan lack natural resources. The supply lines of raw material were in other countries.
Both Germany and Japanese governments were heavily influenced by corporate houses of their respective countries. In Japan, the Big 4 zaibatsu conglomerates had high impact in starting war by provocating military officials to attack Chinese position near Manchurian province. All the war machinary and items were sold by these companies to earn massive profits. Germany's corporate world also used their power to influence hitler to pursue his world domination as they were the main suppliers of nazi military .
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