<P> Politics Among Nations: The Struggle for Power and Peace is a political science book by Hans Morgenthau published in 1948 . </P> <P> The book introduces the concept of political realism, presenting a realist view of power politics . This concept played a major role in the foreign policy of the United States, which made it exercise globe - spanning power in the Cold War period . The concept also called for a reconciliation of power politics with the idealistic ethics of earlier American discussions about foreign policy . </P>

Who said politics is the struggle for power