The list of American grievances is long: Pakistan developed nuclear weapons while promising the United States that it would not; the United States helped arm and train Mujahideen against the Soviets during the 1980s, but Pakistan chose to keep these militants well armed and sufficiently funded even after the Soviet withdrawal in 1989; and, from the American perspective, Pakistan's crackdown on terrorist groups, particularly after 9/11, has been halfhearted at best.