Encyclopedia of U.S. Political History This link opens in a new windowExplores the events, policies, people, ideas, institutions, groups, and movements that have created and shaped political life in the United States. With contributions from scholars in the fields of history and political science, this encyclopedia provides students, researchers, and scholars the opportunity to examine the political evolution of the United States from the colonial period to the present day. It identifies and illuminates patterns and interrelations in American political institutions, culture, and behavior.