The 20th century was full of conflict and war, which ultimately changed the balance of power worldwide. From World War I, World War II, The Cold War, and beyond, the 20th century was a century of warfare. Just how much do you know about this important and influential period in history? Are you a history buff? Do you know everything about World War I, World War II, and the Cold War? Well, it’s time to put your money where your mouth is. Test your history IQ of 20th century Europe here.