Most states in the U.S. now have some form of publicly funded Pre-Kindergarten. This brief asks what they have done to ensure the quality of their programs. It does so by mapping state adoption of three popular program quality assurance features: Early Learning Standards, Kindergarten Entry Assessments, and Tiered Quality Rating and Improvement Systems. We find that all three are now widespread across the American states, despite little research on their effects. We suggest that these quality assurance features need to be subjected to rigorous evaluation tied to their effectiveness in improving student outcomes. (author abstract)