The answer is simple: 9/11. The most costly terrorist attack ever was carried out from Afghanistan. The United States showed bipartisan determination to bring the perpetrators to justice and—the part that explains our continuing engagement in Afghanistan—to prevent its soil from ever being used again to stage terrorist attacks.

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Instead of continuing their endless battling, the United States and Pakistan should acknowledge that their interests simply do not converge enough to make them strong partners. Giving up the fiction of an alliance would free up Washington to explore new ways of achieving its goals in South Asia. And it would allow Islamabad to finally pursue its regional ambitions -- which would either succeed once and for all or, more likely, teach Pakistani officials the limitations of their country's power.

Pundits tend to treat terrorism and guerrilla tactics as something new, but nothing could be further from the truth. Although the agendas have changed over the years -- from tribalism, to liberalism and nationalism, to socialism, to jihadist extremism -- guerrilla and terrorist warfare has been ubiquitous throughout history and consistently deadly.

In this Policy Innovation Memorandum, Daniel Markey argues that U.S. officials should resist temptations to lend support to Pakistani leaders with "pro-American" leanings.

NATO Secretary General Anders Fogh Rasmussen held a final press conference on February 22, 2013, after meetings of NATO Defence Ministers regarding the International Security Assistance Force and the transition in Afghanistan.

Fawzia Koofi, Afghan Member of Parliament, women's rights activist, and presidential candidate, speaks about what to expect for Afghanistan after U.S. troops withdraw in 2014.

Throughout Chuck Hagel's marathon confirmation hearing, America's decade-long war in Afghanistan was noticeably overlooked. But it is curious to see the next secretary of defense receive so few inquiries from senators about the war whose end he will presumably oversee in the coming years, says Gayle Tzemach Lemmon.

After a week with Lt. Col. Mohammad Daowood's battalion, "what I found is that the [Afghan National Army] looks very different when there are no Americans around."

Gender inequality remains widespread in India. Women could combat it by asserting their rights, says Jagdish N. Bhagwati.

Admiral Dennis Blair and CFR's Micah Zenko discuss U.S. drone strike policies.

Hina Rabbani Khar, the minister for foreign affairs for Pakistan discusses the implications of U.S. and NATO troop reduction and withdrawal from Afghanistan, U.S.-Pakistan relations, and details surrounding the U.S. operation that killed Osama Bin Laden.

Max Boot argues that substantial withdrawals of American military personnel from Afghanistan ignore the reality of the situation.

All signs suggest that the United States will not be keeping large numbers of forces in Afghanistan for much longer, says CFR's Stephen Biddle.

President Obama and President Karzai published this joint statement on January 11, 2013, which discusses the future of U.S.-Afghan relations.

President Obama and President Karzai held a joint press conference at the White House on January 11, 2013, to discuss the transition in Afghanistan.

Despite the fact that Malala Yousafzai, the fourteen-year-old Pakistani women's rights activist, survived an assassination attempt by the Taliban, similar attacks against women, like the one in India, are on the rise. Gayle Tzemach Lemmon says that these attacks are efforts to stamp out women's progress and the potential of women worldwide will not be realized if this type of violence is tolerated.

Micah Zenko says the nomination of John Brennan to become the next CIA director can be crucial in scrutinizing the U.S. drone program.

Secretary of Defense Leon Panetta and Chairman of the Joint Chiefs of Staff General Martin Dempsey held this press conference on January 10, 2013. They discussed Afghan President Karzai's visit, defense sequestration, and possible chemical weapons in Syria.

Gayle Tzemach Lemmon says that the war in Afghanistan, which has spanned a decade and cost more than 2,000 American lives, has now faded to one key, albeit short-sighted, question: How many U.S. troops will remain after 2014?