WASHINGTON (AP) — Sixteen years of U.S. warfare in Afghanistan have left the insurgents as strong as ever and the nation's future precarious. Facing a quagmire, President Donald Trump on Monday will outline his strategy for a country that has historically snared great powers and defied easy solutions. America's longest-running war began well as U.S.-led forces quickly toppled the Taliban government and disrupted al-Qaida leaders who plotted the Sept.