One cause of World War II was Hitler's actions. Which were that almost immedieatly after he became chancllor in 1933, he secrectly began to build the Army and weapons.In 1934 the army increased by alot. He also began to aslo build warships and the German airforce. Britain and France were well aware of his actions. He made important alliances, which on was the Rome-Berlin Axis Pact which was the alliance with Mussolini in Italy. Another Pact was the Anti-Comitern Pact which was an alliance with Japan. These alliances were very important to the casue of the war. After the alliances were sign, he had another step which was to take back the land that German lost. He did this top Austria, what he did was he marched troops into Austria, and forced the Austrian leader to vote if they wanted to be part of Germany. The results to this was that 99% voted yes to be union with Germany. Six mouth after the vote in Austria, he wanted the Sudetenland region of Czechoslovakia. People meet with Hitler and said that everything you are doing will cause a war.when he said that he wanted the Sudtenland of Czechoslavakia,he said that he would not invade the rest of Czechoslavakia. In March 1939 he invade the rest of Czechosolavkia. Eventually this was one the start of a war, which is one of the cause of World War II.
Failure of the League of Nations.
The league of Nations were a international organizations that was set up in 1919, that would help keep world peace. All the countries had to be apart of the League of Nations. The main reasons to he failure of the League of nations were: 1. Not all counties joined the Leagues of Nations , 2. The League had no power. 3. The League had no Army 4. Unable to act quickly.
These were some of the reason why the League of Nations were a failure. Which also lead to be one of the cause of the war.
Hitler's actions were one of the reason that World War II started