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World War II was the deadliest military conflict in history. Japan's invasion of Manchuria in 1931 signaled the war, but WWII began in earnest . Poland lost 5 million people or 16% of its total population. A second major cause was the Great Depression. It reduced global trade by 25%. Communism looked attractive.
Explanation: I hope this was helpful to you
Answer:
one cause of world war 2 was the threat from other nations around the world, they threatened U.S. and we didnt want to just sit there so we had to do something and then we engaged but we also had other allies on our team so it definitely helped
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