Albeit this is a basic answer, World War Two was a major catalyst to an increased focus on internationalism. In addition, financial and political interests (most notably for political interests is the Cold War) are both legitimate reasons to why the United States of America has remained as a major part of international affairs.
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Answer:
The Potsdam Conference was held in Potsdam, Germany, from July 17 to August 2, 1945. The participants were the Soviet Union, the United Kingdom, and the United States, represented respectively by Premier Joseph Stalin, Prime Ministers Winston Churchill and Clement Attlee, and President Harry S. Truman. The Potsdam Conference (July 17-August 2, 1945) was the last of the World War II meetings held by the “Big Three” heads of state. The leaders arrived at various agreements on the German economy, punishment for war criminals, land boundaries and reparations.