Sir Oliver Franks served as British Ambassador to the US between1948 and 1952. This was a seminal period in postwar history, which saw the implementation of the Marshall Plan, the emergence of the Cold War, the signing of ther North Atlantic Treaty, the Korean War and the assimilation of the former enemy powers of Germany (or the western part at least) and Japan into the international system. During these years, Britain was regarded as the principal ally of the US in the east-west confrontation. This gave British policymakers an opportunity to influence both US policy and international developments.