Us troops fought the longest war in which country? During which years were the troops in this country ?

Afghanistan War was the longest. international conflict in Afghanistan began in 2001 that was triggered by the September 11 attacks and consisted of three phases. The first phase—toppling the Taliban (the ultraconservative political and religious faction that ruled Afghanistan and provided sanctuary for al-Qaeda, perpetrators of the September 11 attacks)—was brief, lasting just two months. The second phase, from 2002 until 2008, was marked by a U.S. strategy of defeating the Taliban militarily. The troops were there all the way til 2009