The tension between personal liberties and national security, always ready to erupt in the political fights played out in Washington, D.C., became a daily concern for all U.S. citizens in the wake of the attacks on September 11, 2001. Readers will find that each article provides a thorough commentary and analysis of documents. The primary source document, often reproduced in its entirety, includes sections that provide Summary Overview, the Defining Moment, Author Biography, Document Analysis, and Essential Themes.