In a three-wave longitudinal study conducted in the first 100 days of Trump’s presidency, this paper examines how people come to self-categorize into the emerging social movement “the Resistance,” and how self-categorization into this movement influences future participation in collective action and perceptions of the movement’s efficacy. Conventional collective action (e.g., protest, lobby legislators)—but not persuasive collective action (e.g., posting on social media)—and perceived identity consolidation efficacy of the movement at Wave 1 predicted a higher likelihood of self-categorization into the movement 1 month later (Wave 2) and 2 months later (Wave 3). Self-categorization into the Resistance predicted two types of higher subsequent movement efficacy perceptions, and helped sustain the effects of conventional collective action and movement efficacy beliefs at Wave 1 on efficacy beliefs at Wave 3. Implications for theory and future research on emerging social movements are discussed.

在特朗普总统任职的前100天进行的三波纵向研究中，本文研究了人们如何自我归类为新兴的社会运动“反抗”，以及对这一运动的自我归类如何影响未来对集体的参与动作和对运动功效的看法。传统的集体行动（例如，抗议，游说立法者），但没有说服力的集体行动（例如，在社交媒体上发帖），以及在第一波运动中感知到的身份巩固功效，预示着将自我归类为运动的可能性更高稍后（波形2）和2个月后（波形3）。对抵抗运动的自我分类预测了两种更高的后续运动功效感知，