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.

The war on terror may be over, but it's left behind a terrible human rights legacy--and Barack Obama has done very little about it, says James Traub, a fellow at the Center on International Cooperation.

Edward Alden and Liam Schwartz explain how a safe and simple visa process can help the U.S. tourism industry.

Edward Alden and Liam Schwartz recommend a visa screening system that will benefit U.S. security and the economy by focusing scrutiny on high-risk travelers and speeding approval for low-risk ones.

Laurie Garrett discusses the tenth anniversary of the post-9/11 anthrax attacks and argues, ""If 9/11 marked the single most powerful moment of American unity since Pearl Harbor, the anthrax mailings ushered the opposite..."

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.

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

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

Edward Alden says the Department of Homeland Security has developed a sensible and effective way to track visa overstays, but the question now is whether Congress will embrace it.

Experts examine the strategic and tactical policies of the United States in regards to homeland security, as part of a CFR symposium, 9/11: Ten Years Later.

Richard A. Falkenrath, John McLaughlin, and Juan Zarate discuss the extent to which the U.S. is still vulnerable, as part of a CFR symposium, 9/11: Ten Years Later.

Philip Zelikow discusses security paradigms and their potential futures since 9/11, as part of a CFR symposium, 9/11: Ten Years Later.

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 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.

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.