The depth soon became clarified. Two later critics of Pax Americana, Michio Kaku and David Axelrod, interpreted the outcome of Pax Americana: "Gunboat diplomacy would be replaced by Atomic diplomacy. Pax Britannica would give way to Pax Americana." After the war, with the German and British militaries in tatters, only one force stood on the way to Pax Americana: the Soviet Army. Four years after this criticism was written, the Red Army withdrew, paving the way for the unipolar moment. Joshua Muravchik commemorated the event by titling his 1991 article, "At Last, Pax Americana". He detailed: