On September 11, 2001 the whole world was astonished and shocked by witnessing a moment which had become a significant date not only in the history of the United Stated but of the whole of humankind’s. The attack on the World Trade Center in New York and on the Pentagon in Washington, D.C. by 19 hijackers made the Western world realize that despite its enormous budget spent on military equipment and facilities, they cannot defend themselves from attacks as they had always believed but the US can be as vulnerable as any other countries of the world. The US had to face the fact that it can be defeated in any possible moment by an enemy who had not been considered as a real and hazardous threat to American society. The event, which had been unprecedented in entire human history, was a result of a long-lasting conflict between the East and West which had been being fought for several different reasons, mostly to gain power and possession of authority and, last but not least, of oil.