At the beginning of the 21st century, the United States is criticized widely for its attitudes to treaty-making. It has sought to oppose, or withdraw from, a number of treaties such as the Kyoto Protocol or the Anti-Ballistic Missile Treaty. Such behavior is conventionally attributed, in neo-realistic international law and political science theories, to the interests and ideologies that the US Government articulates. This essay uses a constructivist approach, namely focusing on how treaty-making is shaped by the interpretive work of people regarding the world they live in, to expand the analysis to include structural and cultural factors. The United States' treaty-making is also affected by the decentralized and participatory system of government, and by broader societal commitments to political transparency and culturally contingent understandings of risk.