This book considers eleven key thinkers on American foreign policy during the inter-war period. All put forward systematic proposals for the direction, aims and instruments of American foreign policy; all were listened to, in varying degrees, by the policy makers of the day; all were influential in policy terms, as well as setting the terms of contemporary debate. The focus of the volume is the progressive agenda as it was formulated by Herbert Croly and The New Republic in the run-up to the First World War. An interest in the inter- war period has been sparked by Americäs part in international politics since 9/11. The neo-conservative