You may be interested in the following replies I've written, firstly, regarding the real intentions behind the Monroe doctrine, and how it led the US to constantly interfere with South American democracies via the School of the Americas, later renamed WHINSEC, and then, a more Argentina focused one that includes some key elements and evidence that helps us understand US involvement in Argentina's last military dictatorship, including fragments from a transcript in which Henry Kissinger discusses how they knew that the coup was being planned months in advance, and how they knew that the military was going to violate human rights.