Which of the following was not one of the major events of World War II prior to December 1941? A. Democratic countries in Europe appeased Hitler by letting Hitler take the Sudetenland, Czechoslovakia, and Austria. B. The United States declared war as a result of Germany's invasion of Poland. C. Japan occupied Manchuria and other parts of China. D. Japan invaded French Indochina and threatened Thailand, the Philippines, and other Pacific nations.