For that, I recommend reading the book House of Bush, House of Saud : The Secret Relationship Between the World's Two Most Powerful Dynasties [0]. The short answer to your question is: money, oil and corruption. The Vice President's official salary was about 10% of his annual income (from the company he was CEO of) that he still received as VP.
The administration devoted a huge amount of effort into convincing the public (both domestic & foreign) that the House of Saud had nothing to do with 911 and that some other random bad guy just happened to be responsible for it all. Like one of those old Bond movies where the Head Villain looks the the henchling who failed directly in the eyes, then saying "this is what we do to failures, then turns and kills the guy standing next to him.
The administration devoted a huge amount of effort into convincing the public (both domestic & foreign) that the House of Saud had nothing to do with 911 and that some other random bad guy just happened to be responsible for it all. Like one of those old Bond movies where the Head Villain looks the the henchling who failed directly in the eyes, then saying "this is what we do to failures, then turns and kills the guy standing next to him.
0 - https://www.amazon.com/House-Bush-Saud-Relationship-Dynastie...