The War in Afghanistan was an armed conflict from 2001 to 2021. It began when an international military coalition led by the United States launched an invasion of Afghanistan, toppling the Taliban-ruled Islamic Emirate and establishing the internationally recognized Islamic Republic three years later. The conflict ultimately ended with the 2021 Taliban offensive, which overthrew the Islamic Republic, and re-established the Islamic Emirate. It was the longest war in the military history of the United States, surpassing the length of the Vietnam War (1955–1975) by approximately 6 months.