World War I: Also known as the Great War, WWI was fought from 1914 to 1918 and involved many countries worldwide due to complex alliances and geopolitical tensions.
Cold War: The Cold War was a period of political tension between the United States-led Western Bloc and Soviet Union-led Eastern Bloc after World War II until around 1991. Although no direct military conflict occurred between them, proxy wars took place around the globe.
Nuclear Arms Race: The competition between the United States and the Soviet Union to develop and acquire more nuclear weapons during the Cold War. It heightened global tensions and had a significant impact on international relations.