How did ww1 start World War 2?

World War II had its origins in World War I in the following two ways: First, the nationalistic ambitions and fervor of World War I had not disappeared by the time World War II erupted; indeed, they continued to serve as causes of conflict among European nations. Second, the harsh punishments imposed on Germany by the victors of World War I led to bitterness and vengefulness among Germans. This feeling was manipulated by the Nazis, who themselves were driven by vengeance, which led directly to the Second World War.