One goal of U.S. involvement in the war in Afghanistan was to eliminate terrorist threats posed by groups such as al-Qaeda. A challenge faced in achieving this goal was the decentralization of the Taliban and other extremist groups, making it difficult to completely eradicate the threat. In the case of Iraq, a goal was to remove Saddam Hussein from power and prevent the proliferation of weapons of mass destruction. However, a challenge in achieving this goal was the sectarian violence that arose in the aftermath of the Iraq War, leading to further instability in the region.
