When an aggregate demand curve moves to the right, it tells that there are improvements in the economy. It shows that the rate of the unemployment rate is low, there is lower inflation, production of goods are relatively high and at a low price.
After the First World War, and the treaty of Versailles, the economic and political situation was not good. Hitler was opposed to the new Weimar Republic. Also, as a german soldier, he found it hard to accept the defeat of the German Empire. As many nationalists, Hitler believed that Germany had lost the war due to betrayal. Socialists, communists and Jews were blamed, even though many had served in the war and many other were killed.
Hitler thought the German people were a superior race, that were destined to be the masters of Europe, and that jews, homosexuals and black people, among others, were a threat for Germany. According to Hitler, they were an inferior race, that was poisoning the german.
The main spark that started WWI was the assassination of Archduke Ferdinand.
Hope this helps!
No, because they weren't right there when it started ti figure out why it started I believe I might be correct if not sorry!