"False flag terrorism" occurs when elements within a government stage a secret operation whereby government forces pretend to be a targeted enemy while attacking their own forces or people. The attack is then falsely blamed on the enemy in order to justify going to war against that enemy.
There are many examples of false flag attacks through history. For example, it is widely known that the Nazis, in Operation Himmler, faked attacks on their own people and resources which they blamed on the Poles, to justify the invasion of Poland.
Though fortunately no US false flag has come close to reeking the same level of damage, human suffering and horrible consequences since 9/11, the US government has persisted in engaging in more recent false flag operations. Last August 21st in a Damascus suburb a chemical weapons attack launched by US and Saudi backed al Qaeda militants killed many innocent Syrian civilians with many children among the casualties.
The abundance of reliable information in this essay suggests that not only has the U.S. in the past conducted false flag operations, but there is a possibility that 9/11 involved some element of this deceit, and a future false flag operation cannot be ruled out.