Arianna Huffington: Sao Paulo, Brazil - Brazil's economic expansion -- the Brazilian Boom -- is all the more remarkable because the country's problems were long thought to be intractable: high inflation, high crime rate, high income inequality. Among all the changes happening here, the most transformative is the number of people entering the middle class. Between 2003 and 2009, 29 million people took that step up the socioeconomic ladder. As a result of the economic good times, Brazilians have an exceptionally optimistic outlook on their future. Indeed, in many ways Brazil has become like a photo negative of America. Brazilians are increasingly living the American Dream of upward mobility, while nearly two-thirds of Americans no longer believe their children will live better lives than they did. Maybe we need to rebrand it the South American Dream. Click here to read more.