I have devoted 'some' time to reading about South American history (not a fraction as much as I have devoted to US History of course). It seems difficult to pinpoint but overall South America, largely as a whole, seems to be finding difficulty finding a sustainable route to prosperity and liberty.
Over the last fifty years you see swings to the right, and currently a trend to swing to the left.
On the one hand Morales is clearly the elected leader of Bolivia, but on the other he is nationalizing industries (
http://www.cfr.org/publication/10682/#5); always a dangerous move

and he seems to have the support of Venezuela and Cuba (if Chavez and Castro support it; its real easy for me to be against it)