Which event led to World War II? A. Prime Minster Chamberlain took action against German invasions. B. President Roosevelt enforced an anti-German foreign policy. C. Germany was blamed as the cause of World War I. D. Japan bombed Pearl Harbor without warning.
World War II began because of Germany's invasion of Poland, and them refusing to leave, in which Great Britain and France declared war on Germany. This lead to a domino effect of allies of different countries declaring war.
