The sixth edition of this series thoroughly updates each of the 50 state entries as well as entries on the District of Columbia, Puerto Rico, U.S. Caribbean dependencies, U.S. Pacific dependencies, and the United States as a whole. Entries cover the geography, history, politics, economy and other facts about each state or area profiled. Alphabetically arranged entries feature consistent subheadings for each state so students can quickly find comparative information. An index of people, places and subjects makes searches easy, and sources for further study provide students with the next step to learn more.