The effects that WWI had on Germany was that they lost allies and suffered huge territorial losses giving away its land and population to Poland, Russia, France, Belgium, and Denmark, and ultimately had to sign the Treaty of Versailles. After the U.S involvement in the first World War it lead directly to the Great Depression and WWII, The Treaty of Versailles led to a system where the U.S was cashing in its wartime loans to the U.K which in turn was using the wartime reparations it received from Germany to pay off the U.S.
After the Soviet Union lost twenty million soldiers in WW2, Stalin wanted to make buffer zones around friendly states so they would never be invaded again.
