AFAIK, canon largely ignores South America. I see Brazil becoming a global power. IRL, they're economy is going gangbusters (relative to most countries hit hard by the current is-it-or-isn't-it global recession). It's got all of the factors of production and has recently taken on a greater leadership role in the region. During the Twilight War/WWIII, it's possible that South American countries began fighting one another over regional hegemony, however, during the last 50-100 years, wars between South American countries have been few and not too deadly/destructive (internal conflicts are another issue). In the case of a regional war, Brazil's rise might be delayed by a decade or two. Argentina is their closest rival but I don't see them eclipsing Brazil. Whether peacefully or by force, I could see Brazil being at the head of a South American confederacy of some sort, along the lines of EU/NATO. It's a continent rich in resources (Venezuelan oil, Chilean minerals, Argentinian and Uruguayan meat and grain, Brazil has some of everything). If they can get their act together, I can see The Confederacion de Estados Sudamericanos (CES)* being the richest and strongest world power in 2100.
*I didn't go with Estados Unidos de [Sud]america because that's too close to what Latin American countries call the USA.
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