After months of negotiation, Zalmay Khalilzad, President Trump’s special envoy for Afghanistan, announced that he and the Taliban had agreed on a “framework” for a peace deal. While not formalized, the framework would have the United States withdraw from Afghanistan and the Taliban guarantee to allow no terrorist group to use Afghan territory to strike at America. For Trump and many of his supporters, eager to extricate the U.S. from its longest war, it will suffice.

The problem, however, is that such an agreement has been tried before — and it culminated in the Sept. 11 terror attacks.