1 Département de Psychologie, Université du Québec à Montréal, Montréal, QC H3C 3P8, Canada.
2 Psychology Department, Concordia University, Montréal, QC H3G 1M8, Canada.
3 Lady Davis Institute, Jewish General Hospital, Montréal, QC H3T 1E1, Canada.

In superdiverse societies like Canada, characterized by high levels of cultural and ethnic plurality, national identity boundaries are often blurry. While policies may officially promote inclusiveness, public discourse on national identity is frequently dominated by mainstream groups, whose willingness to expand these boundaries plays a crucial role in fostering minority inclusion. Despite the importance of inclusivity for social cohesion, little is known about what enables majority group members to adopt a more inclusive national identity. This study addresses this gap by exploring the role of cognitive flexibility in facilitating an acculturative shift toward inclusiveness. Using latent class regression analysis (N = 202), we identified two distinct national identity profiles: one more inclusive and the other more exclusive. We also examined how factors such as ethnic vs. civic views on national identity, acculturation orientations toward integration, and personal identification with traditional English Canadian vs. multicultural identity representation shape these profiles. Our findings revealed that higher cognitive flexibility was positively associated with the likelihood of belonging to the more inclusive profile. This study contributes to a limited body of work on majority group acculturation, offering insights into how cognitive flexibility may encourage a broader and more inclusive national identity. Implications for policy and social cohesion are discussed.