After the September 11, 2001 attacks the United States went to war. With thousands of Americans killed, billions of dollars in damage, and aggressive military and security measures in response, we are still living with the war a decade later. A change of presidential administration has not dulled controversy over the most fundamental objectives, strategies and tactics of the war, or whether it is even a war. This book clears the air over the meaning of 9/11, and sets the stage for a reasoned, clear, and considered discussion of the future with a collection of essays commemorating the 10th anniversary of the attacks. The contributors include supporters and critics of the war on terrorism, policymakers and commentators, insiders and outsiders, and some of the leading voices inside and outside government.