"September 1 1 incident" is also called "September 1 1" and "September1/terrorist attack", which refers to September 1 1.

At 9: 00 a.m. on September 9th 1 1 (Beijing time 1 2 1)[2] The World Trade Center in New York began to have plane collision incidents continuously [1], and two buildings of the World Trade Center in New York10 floor. The Pentagon was partially damaged and some structures collapsed; The attack filled the air in Manhattan with dust and smoke.

When terrorists attacked the World Trade Center and the Pentagon, the troops all over the United States entered the highest alert state [3]. Although the Taliban issued a statement that bin Laden had nothing to do with this terrorist incident [4], the US government still identified bin Laden as the prime suspect in this terrorist attack [5]. In response to this attack, the United States launched the "war on terror", invaded Afghanistan, destroyed the Taliban hiding Al Qaeda terrorists, and passed the USA Patriot Act. 107, US President george walker bush announced that he would start a military strike against Afghanistan [6].

The "9 1 1" incident was the most serious terrorist attack in the United States, with a total death toll of 2,996 [7]. There are different statistics about the property losses in this incident. According to a report released by the United Nations, the economic losses caused by this terrorist attack amounted to 200 billion US dollars, equivalent to 2% of GDP in that year [8]. The loss caused by this incident even reached 1 trillion dollars [9].

This incident had a profound psychological impact on the American people, and Americans' sense of economic and political security was seriously weakened [8].