Christian nationalism and white racial boundaries: examining whites' opposition to interracial marriage

How does the convergence of national and religious identities potentially fortify white racial boundaries in the USA? Focusing on openness to racial exogamy as an indicator of racial boundaries, we examine the link between Christian nationalism and white Americans' views towards their hypothetical daughter marrying an African American, Latino, or Asian. Drawing on insights from social identity complexity theory, we argue that the convergence of religious and national identities serves to reinforce in-group boundaries, thereby fortifying notions of white purity, and consequently, strengthening whites' discomfort with potential race-mixing in marriage. Multivariate analyses of national survey data demonstrate that Christian nationalism is strongly associated with an increase in white Americans' discomfort with a daughter marrying any racial minority, and particularly African Americans. We demonstrate how the convergence of religious and national identities in Christian nationalism influences whites' regulating of racial boundaries (evidenced in intermarriage attitudes) above and beyond the independent effects of political conservatism or religious exclusivism.