Economic changes after World War 1?

After World War I America was recieving income form the Germans and looked at as the backbone of all military might. But politicians were tinkering with the economy and mainly relying on German income. The 91920s was really as good as it got for America until the Stock Market crashed creating a domino effect of economi crash worldwide. The United States had it worst during the 1930s until the Germans decided to start the next World War. Once the next World War started the economy sky rocketed and after that the governemnt made a plan to keep the economy from crashing again. But later on we made some tweaks again and at the moment we are in an economic hell hole.