With Franklin Roosevelt's death in April of 1945, Vice President Harry Truman and Sen. Arthur Vandenberg, the Republican leader on foreign policy, inherited a world in turmoil. With Europe flattened and the Soviets emerging as America's new adversary, Truman and Vandenberg built a tight partnership with one another to address the challenges at hand. Working in strong bipartisan fashion at a bitterly partisan time, they crafted a dramatic new foreign policy through which the United States stepped boldly onto the world stage for the first time to protect its friends, confront its enemies, and...