Horror. Sadness. Protests. Military action. Conspiracy theories. From personal loss to economic upheaval to a paradigm shift in U.S. foreign relations, few events in the past 100 years have impacted American life so greatly as the terrorist attacks of September 11, 2001. This comprehensive two-volume set details every event leading up to 9/11, going back up to a decade prior to the attacks, and including all participants from any place in the world. Also covered are events since the attack that have influenced our understanding of the ordeal. With A-Z entries, descriptive sidebars, and over 40 primary documents, The 9/11 Encyclopedia is an essential source for understanding one of the blackest marks on the pages of American history.