 "None of our countries will really be prosperous, without all of us being also prosperous," said the Brazilian president.The name of the new secretary-general of the organization will remain unknown until the next presidential meeting in Mar del Plata, Argentina.Guyana, which took over the Unasur rotating presidency from Ecuador, is one of South America's poorest countries and for this reason, President Lula has already announced that Brazil will provide assistance for Georgetown's efforts in presiding over the regional bloc.