The 250th Anniversary of the United States of America Encyclopedia explores some of the most important people and events in the nation’s history. Readers will learn about the founding of the United States and the triumphs, challenges, and innovations of the 250 years that followed. Features include a glossary, maps, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Encyclopedias is an imprint of Abdo Reference, a division of ABDO.