The World Trade Center building in the United States is a steel structure building, and before the 9 1 1 incident, the steel structure building was never destroyed by fire! A fire broke out in the North Tower of World Trade Center 1975, and the burning time of the fire was twice that of the 9 1 1 incident. But the North Tower of the World Trade Center didn't collapse at all, so it can't be caused by burning!
Even if the plane hits, at most, the upper part of the impact collapses. And the lower part of the plane should not collapse! In fact, the whole World Trade Center building collapsed. This situation should not have been caused by a plane collision at all!
Aircraft collision and fire burning are not the main causes of the collapse, so it is most likely that someone knew about the terrorist attack in advance. In order to completely blow up the World Trade Center, a large number of explosives were placed in the key position of the World Trade Center in advance, which will lead to the collapse of the World Trade Center as a whole! The only explosive that can make steel structure buildings ignore the barriers of each floor and speed up the collapse is the US military explosive thermite. In fact, a lot of molten steel was found in the basement of the World Trade Center, and the smoke at the 9 1 1 explosion site also conforms to the chemical principle of alumina!
As the largest military power in the world, the United States is in a leading position in the world in military strength. How can such a vast country not have its own air defense system? As we all know, the Patriot air defense system in the United States is an advanced air defense system in the world, not to mention passenger planes, and even many fighters are difficult to break into American airspace!
Obviously, the United States did not fail to find these four hijacked passenger planes, but deliberately let them in! Otherwise, with the help of American patriots, the hijacked passenger plane might have been shot down before it entered the city, and it would not have caused such a big loss!
Before the 9 1 1 incident, the economic situation of the World Trade Center in the United States was very poor. The United States had planned to demolish the World Trade Center building, but the passenger plane hijacked by terrorists just hit the World Trade Center Twin Towers. What a coincidence!
At the same time, before the 9 1 1 incident, someone bought a building and demanded a high premium from the insurance company, which made the insurance company pay huge compensation after the 9 1 1 incident! People who have the ability to buy a house are definitely not simple, and something happened just after they bought the house insurance. What a coincidence!