You left out the fact that in April 1964 Brazil's democratically elected government was deposed -- with full and explicit US support -- by the military, who remained in power for the next 20 years. Until the Argentinian war for the Falklands convinced the US that military dictatorships was not a good way to control Latin American countries, and they switched to a different method.
That puts a somewhat different light in the "US intervention" you have there.