In OTL, on the 20th September 2001, Undersecretary of Defence for Policy Douglas Feith recommended US intervention in South America instead of Afghanistan, apparently in the border region between Brazil, Argentina, Paraguay. According to Feith, attacking a non-Al-Qaeda target would "surprise" the terrorists.
The question is what would be the result of such an intervention.
The question is what would be the result of such an intervention.