“…We review existing research on the role of intergroup attitudes and group-based identification for political outcomes in the United States and Canada, as well as the growing literature on White identity in the United States (Jardina, 2019(Jardina, , 2020Berry et al, 2021;Petrow et al, 2018;Sides et al, 2018;Croll, 2007). For the comparison between White identity and Whites' negative outgroup attitudes, we refer to the American literature on how anti-Black attitudes shape policy preferences and political behaviour (Gilens, 1995(Gilens, , 1996DeSante, 2013) as well as the burgeoning Canadian literature on how anti-Indigenous attitudes shape politics (Harell et al, 2014(Harell et al, , 2016Beauvais, 2020Beauvais, , 2021.…”