I wouldn't say "south America" has a "warzone" problem. Other than Mexico, Colombia and a few of the small Central American nations, South America has been pretty peaceful for decades. The places with war problems all have one thing in common - far right wing governments which have strong US backing. And those are a small minority now, with most of South America being led by social democratic parties.
Actually, South America now have their shit together to the point they've formed a union based on the EU. Isn't it weird how the American media haven't been telling you all about that? Doesn't play into US interests maybe?
http://en.wikipedia.org/wiki/Union_of_South_American_Nations^ Founded in 2008. Basically South America has a unified parliament, central bank and a rotating presidency now, a formal 12-nation military alliance and are talking about forming a single currency. Population of this bloc is ~400 million, GDP ~$5 trillion
"barely worth mentioning" apparently, according to the US press.
http://en.wikipedia.org/wiki/Community_of_Latin_American_and_Caribbean_States^ founded in 2010. 33 nation alliance, all the way from Argentina to Mexico. Population of this bloc is ~600 million, GDP ~$6 trillion
Apparently your media bosses have also decided America doesn't "need to know" this is going on.
While this stuff was starting up - via diplomacy and a lot of it started by Hugo Chavez - the American media bombarded everyone with the idea that Venezuela has been heavily militarizing for the last decade (pure fiction if you look at the CIA's own country data) and all his neighboring countries trembled in fear of Chavez's "wrath". They need you to stay stupid and believe South America is on the brink of collapse when in fact they're reaching out and joining hands. That justifies future American military interventions.
In fact, America's best friend in South America, Colombia, has been the ONLY country pissing on all their neighbors, bombing, threatening cross-border raids etc. This suits America fine. Everyone down there is getting way too chummy with each other and working together, so let's fund a fascist government (Colombia) $1 billion per year worth of weapons and back then whenever they threaten their neighbors. Then, America can have the basketcase South America back with it's divisions and paranoia that the USA loves.
What in fact happened (2008) was that Colombia, who have grown their army massively since Bush came to power (Venezuela actually
reduced per GDP military spending), bombed Ecuador, and started spewing paranoid shit around that Ecuador and Venezuela were out to get them. Colombia far outnumbers both those countries for armed forces, and they have US air support / US bomber bases backing them up. America was egging this fight on, but what actually happened was that UNASUR convened and EVERYONE threatened war with Colombia if they pulled this shit - Not just the threatened countries, but Brazil, Argentina, Chile and the rest would ALL be at war with Colombia. After that Colombia totally backed down. See? America wanted the war and was egging it on, Brazil were the guys who knocked heads together and said "settle this peacefully!"
The US government / media during the Bush years had tried to label Venezuela and Ecuador as rogue states, whilst funding a militaristic expansionist government in Colombia who threatened to attack both those countries (in 2008). This was clear "divide and conquer" tactics. But it failed due to the newly-formed UNASUR military alliance.
So, the US and it's client states are the only "warzone" fostering assholes down there right now.