Here are some websites that helped me understand the early childhood education policy landscape in the United States.

Pre-K Now

National Women's Law Center

National Black Child Development Institute

Center for the Developing Child at Harvard University

Early Ed Watch Blog (New America Foundation)

National Association of Child Care Resource & Referral Agencies (NACCRRA)

Office of Head Start U.S. Department of Health & Human Services

Early Stories Blog (Hechinger Institute on Education and the Media, Teachers College, Columbia University)

Center for Law and Social Policy

National Association for the Education of Young Children