Why shouldn't the winner of the war seek reparations on the loser? What is wrong with self-determination - allowing nations to decide what kind of country they want to be?
Why can't America practice isolationism? Along with that, why do we have to have alliances in the modern world?
Why didn't the carving up of the Ottoman Empire and Eastern Europe work in the Treaty of Versailles and prevent WWII?
And why do you think so many Germans and Italians listened to fascist leaders like Hitler and Mussolini? The term is attached if you are struggling with it (https://www. britannica. com/topic/fascism).