Is the Lonely Superpower Getting Lonelier?

This paper systematically assesses the common claim that the United States is becoming increasingly isolated from the rest of the world in multilateral institutions. It employs a new data set that includes post-Cold War roll-call votes in multilateral institution that are identified as important by the U.S. State Department. A multilevel item-response model is developed that allows for differentiation between trends in the preferences of states and trends in the agenda. The model is estimated using Markov Chain Monte Carlo methods. The results reveal that states have indeed gradually shifted their preferences away from the U.S. from 1991 to 2001. But, these changes are independent from shifts in the agenda. During the first half of the 1990s the agenda became more positive for the U.S. thanks to its multilateral initiatives, whereas unilateralist tendencies led to an opposite shift since 1998. Changes in preferences, however, develop at a constant rate. This suggests that the unilateralist turn in U.S. foreign policy is not solely responsible for the increased gap between the U.S. and the rest of the world. The paper discusses the policy and theoretical implications of these findings as well as interesting deviations from the common trend by individual countries. Check author’s web site for an updated version of the paper. [ABSTRACT FROM AUTHOR]