The Cold War began after World War II as tensions grew between the Soviet Union and the United States, who emerged as rival superpowers with opposing ideologies. Over the following decades, their rivalry dominated global politics and led to military conflicts and alliances around the world as each sought to expand their influence. Key events included the formation of NATO, the Soviet blockade of Berlin, the Korean War, the Cuban Missile Crisis, and the Vietnam War, as the two powers confronted each other indirectly through proxy wars. The Cold War lasted over 40 years until the decline and collapse of the Soviet Union in the late 1980s.