Recent debates about whether educators should teach America's racist history have sparked activism and legislation to ensure students are taught American history in such a way that promotes “patriotism,” amplifying cherished national myths, emphasizing American exceptionalism, and erasing negative historical facts. Building on insights from both social dominance theory and Christian nationalism research, we propose Christian nationalism combines legitimizing myths that whitewash America's past with authoritarian impulses and thus seeks to enforce “patriotic” content in public school classrooms. We also theorize this connection varies across racial, partisan, and ideological identities. Data from a nationally‐representative survey of Americans affirm Christian nationalism is by far the leading predictor Americans believe “We should require public school teachers to teach history in a way that promotes patriotism.” This association is consistent across race (possibly due to divergent meanings of both “Christian nationalism” and “patriotism” across groups), but varies by partisanship and ideological identity for whites. Specifically, Christian nationalism brings whites who identify with the ideological and political left into complete alignment with their conservative counterparts who are already more likely to support mandatory patriotic education. Our findings provide critical context for ongoing battles over public‐school curricula and education's role in perpetuating social privilege.