The "Postwar Era" refers to the period following the end of World War II in 1945, characterized by significant social, political, and economic changes. Countries focused on rebuilding their economies and infrastructure, leading to a time of growth and prosperity in many regions, particularly in Western Europe and the United States. During this time, new international organizations, such as the United Nations, were established to promote peace and cooperation. The era also saw the beginning of the Cold War, a period of tension between the United States and the Soviet Union, which influenced global politics for decades.