Read about three wars
World War II:
Militaristic and nationalistic governments rose power in Germany, Italy and Japan as a result of the depression in the 1930s and the Versailles Treaty at the end of World War I, which was seen by Germany as unfair. Global war broke out with Germany's invasion of Poland. The leaders of the 'Allied' powers were Russia, Britain and the USA; the leaders of the opposing 'Axis' powers were Germany, Italy and Japan. The war saw the first use of large-scale bombing raids against civilians by both sides.