This article documents the patterns of White-Black and White-Hispanic enrollment gaps in Advanced Placement (AP) and Dual Enrollment (DE) programs across thousands of school districts in the United States by merging several data sources. We show that the vast majority of districts have racial enrollment gaps in both programs, with wider gaps in AP…

Counter to narratives of persistently failed school reform, we argue that reforms sometimes succeed and seek to understand why. Drawing on examples from the founding of public schools to the present, we find that successful system-wide reforms addressed problems that teachers thought they had by being consistent with prevailing norms and values,…