White Americans may find diversity threatening in part because they construe non-White Americans as a coherent social and political force. We argue that this perception manifests in a belief that minority groups collude against White people and that White people should act as a political bloc to defend ingroup interests. In a 3-year longitudinal study, the belief in minority collusion and support for White identity politics increased significantly among a nationally representative sample of 2,635 White Americans. Compared to White Democrats, White Republicans more strongly endorsed minority collusion beliefs and White identity politics, and increased more in these beliefs over time. Essentialist perceptions of the White ingroup were associated with longitudinal increases in minority collusion beliefs, but not in support for White identity politics. Endorsement of minority collusion and support for White identity politics both predicted lower support for Black Lives Matter and greater support for the Alt-Right movement. Implications for race relations, stigma-based solidarity, and the psychology of partisanship and ideology are discussed.

美国白人可能会发现多样性具有威胁性，部分原因是他们将非美国白人视为一种连贯的社会和政治力量。我们认为，这种看法体现在一种信念上，即少数群体勾结反对白人，并且白人应该作为一个政治集团来捍卫内群体的利益。在一项为期 3 年的纵向研究中，在 2,635 名美国白人的全国代表性样本中，对少数族裔勾结和支持白人身份政治的信念显着增加。与白人民主党人相比，白人共和党人更强烈地支持少数族裔勾结信仰和白人身份政治，并且随着时间的推移，这些信仰越来越多。对白人内群体的本质主义看法与少数族裔勾结信念的纵向增长有关，但不支持白人身份政治。对少数族裔勾结的认可和对白人身份政治的支持都预示着对黑人生命问题的支持率较低，而对另类右翼运动的支持率较高。讨论了对种族关系、基于耻辱的团结以及党派和意识形态心理的影响。