The document summarizes key events of World War II and the postwar period that led to the end of American isolationism and the emergence of American rivalry with Japan. It discusses how the US initially remained neutral but eventually entered the war after Japan's attack on Pearl Harbor. It also outlines the Atlantic Charter signed by the US and Britain that established their alliance and principles for postwar peace. Finally, it examines how globalization accelerated after the war and how the US took on a dominant global role as the sole superpower after the fall of the Soviet Union.