By Carter Malkasian
Editor’s Note: Afghanistan is America’s longest war, and recent attempts to negotiate an end with the Taliban appear to have failed, at least for now. Many Americans are asking whether it is worth staying in Afghanistan as the war drags on. Carter Malkasian, one of America’s premier Afghanistan experts, examines the most important argument for staying—that Afghanistan might again be a haven for anti-American terrorist groups—and from there raises questions that should guide policymakers considering a withdrawal.
Why is the United States in Afghanistan today, 18 years after it first intervened on Oct. 7, 2001? As much as nation-building features in the news, the straightforward answer from senior U.S. officials has been the terrorist threat, as Secretary of Defense James Mattis stated in 2017 Senate hearings: “We must always remember, we are in Afghanistan to make America safer and ensure South Asia cannot be used to plot transnational attacks against the U.S. homeland or our partners and allies.” Yet the U.S. strategy to achieve this goal, for many, is unconvincing. Sen. Elizabeth Warren bluntly argued in the Sept. 12 Democratic primary debate: “What we’re doing right now in Afghanistan is not helping the safety and security of the United States. It is not helping the safety and security of the world. It is not helping the safety and security of Afghanistan.” This post seeks to better explain the logic of U.S. presence in Afghanistan and thus clarify the cases for whether or not American troops need to stay in the country indefinitely.
Terrorism and Counterterrorism in Afghanistan

















