What ideological conflict marked the beginning of the Cold War?

The ideological conflict that marked the beginning of the Cold War was characterized by increasing tensions between the United States and the Soviet Union. This conflict was primarily rooted in differences between capitalism, as advocated by the United States, and communism, as promoted by the Soviet Union. Following World War II, these two superpowers emerged with significantly divergent political and economic ideologies, leading to mutual distrust and suspicion.

The U.S. sought to promote democracy and free-market capitalism, while the Soviet Union aimed to expand its communist system, which they viewed as superior. This ideological divide influenced foreign policies and international relations, resulting in a series of proxy wars, arms races, and competing global spheres of influence that defined the Cold War era. This ideological basis laid the groundwork for numerous events, including the Berlin Blockade, the formation of NATO and the Warsaw Pact, and conflicts in various parts of the world.

Other choices reflect secondary aspects or specific events but do not capture the fundamental ideological disagreement that truly defines the start of the Cold War. The tensions with China, the roles of international organizations like the United Nations, and military conflicts in various regions are significant in the context of the Cold War but stem from the broader ideological struggle between the two superpowers.