In the world of unwritten rules, when it comes to conveying interest, closeness or ranking, the president of the United States has Camp David. An invitation for an official visit sends a clear message, one that does not go unnoticed. In this case, Brazil is in. The South American country, the "B" in the emerging economies of BRIC (Brazil, Russia, India and China), has long expressed its ambition to play an influential role in the world, and is increasingly doing so, for many good reasons. The White House's nod only confirms what many have already been noticing.