What Happened? An Encyclopedia of Events That Changed America Forever is designed to introduce beginning U.S. history students and lay readers to the most significant events in the nation's history. More than that, it also will give readers insight into why a particular event is important.This book consists of 50 chapters in four volumes, each dealing with a critically important event in American history from the 17th century to the present. Each chapter includes a factual essay on the subject prepared by John Findling or Frank Thackeray. The factual material is augmented with an interpretive essay on the same subject, written by a specialist in the field. Through this juxtaposition, readers can learn not only about the who, what, and where of an event, but also why it is important in the sweep of American history.