Despite increased attention being paid to the importance of early education and research showing clear connections between access to Pre-K and K programs and future school success, only 12 states in the U.S. guarantee and fund free, full-day kindergarten to all children by policy. The Childrens Defense Fund has created a great map showing how each state handles Kindergarten access. Click through to their page to play around with the interactive version of the map that gives information on each state. Yes, it costs money to make full-day kindergarten and Pre-K universal. But that investment has a very high rate of return, according to researchers as high as almost any other public policy investment.