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Why did the Holocaust occur?
The Nazis believed that Jews were a problem that needed to be removed. The mass killings of the Holocaust were what Hitler called "The Final Solution"

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Who were the major leaders of World War II?
hitler, roosevelt, truman,tojo,stalin,mussolini, and churchill

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What were the major events of World War II?

Hitler invades Poland on 1 September. Britain and France declare war on Germany two days later

.German 'Blitzkrieg' overwhelms Belgium, Holland and France.

Japan attacks Pearl Harbor, and the US enters the war

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What were the causes of World War II?
Among the causes of World War II were Italian fascism in the 1920s, Japanese militarism and invasions of China in the 1930s, and especially the political takeover in 1933 of Germany by Hitler and his Nazi Party and its aggressive foreign policy.