You asked what 9/11 means to readers and to me it was where the US experienced some of the brutal violence and terror that it has aimed at other nations and peoples for decades. An estimated million people were killed in the CIA backed regime change in Indonesia, many thousands more died in Chile after Allende was removed by CIA. From wikipedia- 'Significant operations included the United States and United Kingdom–planned 1953 Iranian coup d'état, the 1961 Bay of Pigs Invasion targeting Cuba, and support for the overthrow of Sukarno by General Suharto in Indonesia. In addition, the U.S. has interfered in the national elections of countries, including Italy in 1948,[1] the Philippines in 1953, Japan in the 1950s and 1960s[2][3] Lebanon in 1957,[4] and Russia in 1996.[5] According to one study, the U.S. performed at least 81 overt and covert known interventions in foreign elections from 1946 to 2000.[6] According to another study, the U.S. engaged in 64 covert and six overt attempts at regime change during the Cold War.[7]

Following the dissolution of the Soviet Union, the United States has led or supported wars to determine the governance of a number of countries. Stated U.S. aims in these conflicts have included fighting the War on terror, as in the Afghan War, or removing alleged weapons of mass destruction (WMDs), as in the Iraq War. ' https://en.wikipedia.org/wiki/United_States_involvement_in_regime_change