1. What actions made by Germany and Japan lead to the start of World War II?

Historians from many countries gave deep attention to the causes of World War II. Leading themes include the political takeover in 1933 of Germany by Adolf Hitler and the Nazi Party, which ruthlessly promoted an aggressive foreign policy in violation of the Versailles Treaty of 1919, Japanese militarism against China, Italian aggression against Ethiopia, and the success of Germany in forming an agreement with the Soviet Union in August 1939 to divide up Eastern Europe. The immediate precipitating event was Germany invading Poland on September 1, 1939, and Britain and France declaring war on Germany on September 3, 1939.