Although the author focuses mostly on the US collaboration with Saudi Arabian support of jihadi terrorists in recent years, he does make brief reference to their first application against the Soviet Union in Afghanistan which was mainly retaliation for their material support of the National Liberation Front of Vietnam and its struggle for independence from the US Empire.
The US has been working covertly with Saudi Arabia and British military intelligence for more than three decades to foster and fuel al-Qaeda extremists, beginning in Afghanistan to fight the Soviet Union from the late 1970s until 1990.And, then there in considerable evidence of Saudi Arabian involvement in 9/11.