As we prepare to mark the 50th anniversary of Head Start, it's a good time to ponder the current state of preschool in the United States. Are early-learning opportunities reaching enough children? Are they quality programs? Those were among the questions considered by participants Tuesday at what was billed as the first Preschool Nation Summit, co-hosted by Los Angeles Universal Preschool and Scholastic Inc. The three panels at the summit included leaders of various advocacy and nonprofit groups, as well as local, state and national education leaders. Much of the conversation centered around the theme: How does the U.S. become a "preschool nation," or a country that believes all children deserve high-quality early-learning opportunities?