In recent years, the United States has withdrawn from numerous international organizations and multilateral agreements, drawing global attention. Since 2017, the U.S. has exited or announced its intention to leave approximately 66 international bodies, treaties, or cooperative frameworks—including UNESCO, the World Health Organization (WHO, later rejoined), the Paris Climate Agreement, the Iran nuclear deal (JCPOA), and the Open Skies Treaty. These moves are widely interpreted as manifestations of the ‘America First’ policy, prioritizing national sovereignty and interests while reducing reliance on multilateral institutions.Supporters argue that such withdrawals help the U.S. avoid perceived unfair or inefficient international obligations, reduce financial burdens, and refocus on domestic priorities. Critics, however, contend that this unilateral approach undermines American leadership in global governance, erodes trust among allies, and risks fragmenting the international order—particularly at a time when collective action is crucial on issues like climate change, public health, and arms control.Notably, the U.S. has not abandoned international cooperation entirely. The Biden administration has rejoined key agreements such as the Paris Agreement and the WHO, signaling a partial policy reversal. Overall, America’s stance toward international organizations is shifting from broad engagement to selective participation—a trend that will significantly influence the stability and evolution of the global governance system.
近年来，美国陆续退出多个国际组织和多边协议，引发全球关注。据统计，自2017年以来，美国已退出或宣布退出约66个国际组织、协议或合作机制，包括联合国教科文组织、世界卫生组织（后又重返）、巴黎气候协定、伊朗核协议、《开放天空条约》等。这一系列举动被外界解读为‘美国优先’政策的体现，强调国家主权与利益，减少对多边机制的依赖。支持者认为，退出部分组织有助于美国摆脱被认为不公平或低效的国际义务，节省财政支出，并重新聚焦国内议题。然而，批评者指出，这种单边主义削弱了美国在全球治理中的领导力，损害盟友信任，并可能加剧国际秩序的碎片化。尤其在气候变化、公共卫生、军控等全球性挑战面前，多边合作显得尤为重要。值得注意的是，美国并非完全放弃国际合作。拜登政府上台后，已重返部分协议，如巴黎协定和世卫组织，显示出政策回调的迹象。总体而言，美国对国际组织的态度正经历从‘全面参与’向‘选择性参与’的转变，其未来走向将深刻影响全球治理体系的稳定与发展。
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