It was presaged by much U.S. citizens had no idea about at the time, such as President Nixon's earlier dictum to "Make the [Chilean] economy scream" to weaken the elected socialist president of Chile, Salvador Allende, and stir opposition to him and his policies. Here is the CIA's version. Here's a 40th anniversary summary from The Guardian.
There are, of course, many books on the subject, with one of the best being Ariel Dorfman's Chile: The Other September 11: An Anthology of Reflections on the 1973 Coup
Chile and the United States: Declassified Documents Relating to the Military Coup, September 11, 1973
There are, of course, many books on the subject, with one of the best being Ariel Dorfman's Chile: The Other September 11: An Anthology of Reflections on the 1973 Coup
Chile and the United States: Declassified Documents Relating to the Military Coup, September 11, 1973