The document discusses several factors that contributed to the outbreak of World War 2 in 1939, including flawed peace settlements after World War 1 that made Germany resentful, a weak League of Nations that failed to stop aggression, the economic depression that led to the rise of extreme right-wing governments, countries adopting aggressive foreign policies for economic reasons, Hitler breaking the Treaty of Versailles and using force to expand Germany, the aggression of Italy and Japan, the appeasement of Germany by Britain and France that encouraged further aggression, and the failure of Britain, France and Russia to form an alliance against Germany due to ideological differences.