The Cold War originated between the U.S. and USSR after WWII as they emerged as two superpowers competing for global influence and ideological dominance. Tensions grew as Stalin sought to spread communism in Eastern Europe against the wishes of the U.S. and UK. The ideological differences between capitalism and communism, as well as the arms race between the two sides, exacerbated the conflict and divided the world into two spheres of influence, leading to the emergence of the Cold War.