Ignorance of History and Political Differences in Perception of Racism in the United States

According to the Marley hypothesis, White Americans are more ignorant of historical racism than Black Americans, which explains their greater tendency to deny racism in the present. We extended the Marley hypothesis by testing whether it explains political differences in perception of racism among White Americans in the United States. Two preregistered studies measured participants' knowledge of historical racism as well as their perception of present racism in individual cases and in society (N = 463). White Republicans had less knowledge of historical racism and perceived less individual and systemic racism than White Democrats. Consistent with the Marley hypothesis, political differences in perception of individual racism were significantly mediated by knowledge of historical racism. These findings suggest that ignorance of historical racism may partly explain why White Republicans perceive less racism than White Democrats, and therefore extend the Marley hypothesis to the political realm.