After the defeat of Germany in the First World War, was under the Treaty of Versailles, German had lost faith. Hitler, who use to be a war veteran of World War I decide to speak out to his fellow Germans. He blamed the Jews of Germany for the defeat of Germany in World War I. He also wanted a pure race of Aryan, who Hitler believe were true born German. Under the Treaty Germany, couldn't built any sort of military but, Hitler build a Military and no country in Europe does anything about it. He than takes over Czechoslovakia, and still no does anything, after the invasion of Poland, countries in Europe decided to take action against Hitler and his Nazi party, after the invasion of Poland ; Britain and France declared war on Germany two days after the invasion and the war officially started on September 1, 1939. Germany makes alliance with an alliance with Italy, Japan. Let's jump to Japan. When things started to go bad in Japan, the United State decided to stop trades with Japan, and Japan really need their materials. Mad at the United States Japan decided to bomb Pearl Harbor, a US Military base. After this event, the United States declared war Japan, since Japan was in an alliance with Germany, Germany declare war on the US. US than joins an alliance with France, Britain and many other countries and they were the Allies powers, Germany, Italy, Japan, and other countries were the Axis powers. The war went on for many years. After the Allied closed in on Germany they surrender only after a week after Hitler had committed suicide, so Germany had no chance. The war was still going on because Japan had not surrender yet. Japan finally surrender after the United States drop atomic bomb on Hiroshima and Nagasaki (payback!). World War II was thus over on August 16, 1945, but it formally ended on September 2, 1945 when Japan signed unconditional surrender. The war lasted 6 years.