What has happened to establishment internationalism in U.S. foreign policy? Conventional wisdom is rapidly becoming that generational, demographic, and cultural changes within the United States are inexorably leading to the decline of the broad, post-war internationalist consensus that dominated American foreign policy since 1945. Despite considerable diversity, this new cohort of foreign policy types is thought to be more unilateralist and America-first oriented than the preceding generation, and its rise is thought to be a product of both the death of the World War II generation of diplomats and the ascension of new groups and individuals as the political center of gravity in the US has shifted South and West. Despite the frequent assertion that this change has taken place, however, no study has analyzed whether or not in representation or belief if the foreign policy establishment that has emerged is qualitatively or compositionally different. To measure whether or not internationalist representation and thought has experienced a secular decline, this paper identifies a set of empirical indicators to track (1) changes in foreign policy voting patterns by members of Congress (2) changes in representation in the foreign policy elite and (3) changes of beliefs of the main foreign policy players in the Executive Branch and the U.S. Congress. First, we track the voting scores of members of Congress for their “conservative” or “liberal” character using the foreign policy votes from the American Conservative Union (1970-2004) and Americans for Democratic Action (1948-2004). Our second set of indicators track the state of birth, educational profile, and formative international experience of a cross-section of the U.S. foreign policy-making elite, including congressional chairmen and appointed positions in the Department of State, Department of Defense, and the National Security Council. Our third and fourth sets of indicators seek to track the ideational patterns of elite thought as represented by Presidential State of the Union addresses and party platform manifestos. While we find support for increasing partisan polarization in Congress on foreign policy, there is only mixed evidence to suggest that internationalism has experienced a secular decline. ..PAT.-Conference Proceeding [ABSTRACT FROM AUTHOR]