The document summarizes major events and developments related to the United States' involvement in World War 2 and the postwar period up until the late 20th century. It discusses topics like isolationism giving way to involvement through acts like Lend-Lease, the establishment of wartime agencies in the U.S. like the Office of Price Administration, America fighting on two fronts in Europe and Asia, postwar conferences and strategies, the onset of the Cold War and containment policy, conflicts like the Korean War and Vietnam War, arms control agreements between the U.S. and USSR, and diplomatic events involving China and the Middle East over time.