It's not just U.S. industrial behemoths that stand to lose if NAFTA ends – small businesses from the border to the heartland would suffer.

"It doesn't feel like the recession is over in the streets of Brazil, but you find a lot of optimism in board rooms and within the ranks for government," says AS/COA's Brian Winter.

The so-called "Tropical Spring" erupted, grabbed the attention of the world - and then disappeared (Or did it?). An in-depth look, nearly four years on.

Bilateral relations were rocky during the prior administrations, and the Argentine president seeks to reset the tone during a three-day official visit.