It's tempting to see the 9/11 attacks as having fundamentally changed U.S. foreign policy. It's also wrong.

This CFR Issue Guide provides expert analysis and essential background on the central questions facing U.S. policymakers ten years after the September 11 terrorist attacks.

Laurie Garrett discusses the FRONTLINE documentary, "The Anthrax Letters."

Richard N. Haass says that the war in Afghanistan began ten years ago as a narrow, modest war of necessity but has evolved into a broad, ambitious war of choice.

Laurie Garrett discusses the tenth anniversary of the post-9/11 anthrax mailings.

Barry Pavel and Matthew Kroenig argue that while a deterrence approach holds great potential for helping to thwart future al Qaeda attacks, it remains a poorly understood and underutilized element of U.S. counterterrorism strategy.

Leslie H. Gelb argues that after 9/11, a decade of prolonged wars, economic weakness, and political irresponsibility is not an aberration but a historical pattern for America, and it also reveals a flawed tendency in U.S. foreign affairs.

Linda Robinson discusses new attributes that have characterized Special Operations Forces (SOF) operations since 9/11 and their consequences or implications for the future.

CFR's Stuart A. Levey discusses what the United States has learned in the ten years since the 9/11 terrorist attacks with students.

Experts examine the strategic and tactical policies of the United States in regards to homeland security.

This session was part of a CFR symposium, 9/11: Ten Years Later, which was made possible by the generous support of Shelby Cullom and Kathryn W. Davis.

Experts discuss how changes to U.S. domestic and international policy since September 11, 2011 have enhanced counterterrorism approaches and contributed to preventing planned terrorist attacks.

This session was part of a CFR symposium, 9/11: Ten Years Later, which was made possible by the generous support of Shelby Cullom and Kathryn W. Davis.

Philip Zelikow, former executive director of the 9/11 Commission Report, explores the findings of the report and presses the need to hold trials for the 9/11 conspirators.

President Obama gave these remarks at the Pentagon Memorial Service in remembrance of 9/11, on September 11, 2012.

Republican vice presidential candidate Paul Ryan gave these remarks on September 11, 2012.

Republican presidential candidate Mitt Romney gave this statement on September 11, 2012.

President Obama gave these remarks on September 11, 2011, in Washington, DC. He also gave a weekly address that "pays tribute to the first responders, those who have served, and those who lost their lives ten years ago in the September 11^th attacks".

This public law, 107-40 [S. J. RES. 23], was passed by Congress on September 14, 2001 and signed by President George W. Bush on September 18, 2001. The law authorized U.S. armed forces to use "all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001".

Which policies have worked and which ones need work ten years after the worst terrorist attacks in U.S. history? CFR experts examine ten issues that have preoccupied U.S. planners.

While we can contain terrorism, we can't afford the costs of trying to eliminate it and will have to learn how to live with the chronic threat of low-level attacks, says CFR's Stephen Biddle.

While U.S. efforts to forge a better relationship with the Muslim world are important, it will also take leadership within that world to challenge the myths that lead to anger and disapproval toward the United States.