The document summarizes the events leading up to World War II, including the aggressive actions taken by Germany, Italy, and Japan in the 1930s which violated treaties and seized territory. It also discusses the policy of appeasement adopted by Western democracies, which involved giving in to aggressors' demands in order to maintain peace. However, this failed to deter Hitler, who continued his military expansionism. The Western powers eventually recognized appeasement did not work and pledged to protect Poland, leading to Germany's invasion of Poland and the start of World War II.