Final answer:
Winston Churchill, Franklin D. Roosevelt, and Joseph Stalin had the greatest impact on the world after World War II. Churchill and Roosevelt supported the continuation of European colonial empires and free international trade, respectively, while Stalin dominated Eastern Europe and fueled the Cold War.
Step-by-step explanation:
After World War II, several leaders had a significant impact on the world. One leader who had a great impact was Winston Churchill. He believed that the European colonial empires in Africa and Asia should continue as before, which was also supported by the French. However, in the long run, the European empires collapsed with the independence of Asian and African colonies. Another leader who had a major impact was President Franklin D. Roosevelt of the United States. His main interest was maintaining the economic boom that had pulled the U.S. out of the Great Depression through free international trade. This position was successful as free trade exists throughout the world today. Lastly, Joseph Stalin, the leader of the Soviet Union, had a significant impact on the world as well. The Soviet Union dominated Eastern Europe and played a crucial role in the division of the world into mutually hostile spheres during the Cold War. The conflict between communism and capitalism shaped the postwar world and brought economic and political tension.