Following the September 11 terrorist attacks, Congress passed and President Bush signed the USA Patriot Act—legislation intended to thwart the threat of domestic terrorism. Critics were quick to denounce USA Patriot as a dangerous expansion of government power at the expense of our civil liberties. Are the critics right? Or can we win the war on terrorism without sacrificing our civil liberties here at home? And what has the American experience in earlier crises, such as the Civil War and the two world wars, taught us about balancing national security and personal freedom?