<human>:  What is the history of the Afghanistan War?
<bot>: The Afghanistan War began in October 2001 after the United States responded to the terrorist attacks of September 11, 2001 by launching a military invasion of the country. The war was intended to target the Taliban and al-Qaeda, who had been responsible for harboring the 9/11 attackers. The initial campaign was successful in removing the Taliban from power and forcing them to abandon most of their strongholds. However, the war in Afghanistan has since evolved into a lengthy counter-insurgency campaign. Since the initial invasion, other countries have become involved in the conflict, including NATO forces and a number of other foreign militaries. The war has caused massive casualties and displacement, with countless civilian casualties and refugees, as well as a vast amount of destruction to infrastructure. The war is still ongoing and to this day, the situation in Afghanistan remains grave and the future of the country remains uncertain.