Since 1978, Afghanistan has experienced nearly constant conflict, beginning with the Soviet invasion and installation of a communist government. Throughout the 1980s, mujahideen resistance fighters received support from the U.S. and others to combat Soviet forces. After the Soviet withdrawal in 1989, the mujahideen took control but then fractured and fought amongst each other, leading to civil war. The Taliban emerged in the 1990s and established control over most of the country, except for the northern alliance. In 2001, U.S.-led forces removed the Taliban from power following the 9/11 attacks, but conflict has continued as the Taliban wages an insurgency against the U.S.-backed Afghan government.