MIAMI — As the World Cup played out over the past month, yellow-clad Colombians packed the Kukaramakara nightclub downtown, Aguila beers in hand, shouting, “Colombia, Colombia!” Outside, Brazilians in car caravans blasted samba music. Argentines, some in blue-and-white striped jerseys, jammed into nearby steakhouses and empanada joints. Around town, children filed into Sunday Mass, their jerseys ablaze with their futbol heroes from across Latin America.

It was less a commentary on soccer than a tableau vivant of the new Miami, which has gone from a place defined by Cuban-Americans to one increasingly turbocharged by a surge of well-educated, well-off South Americans in the last decade. Their growing numbers and influence, both as immigrants and as visitors, have transformed Miami’s once recession-dampened downtown, enriched its culture and magnified its allure for businesses around the world as a crossroads of the Spanish-speaking world.

“It’s now the indisputable capital of Latin America,” said Marcelo Claure, a Bolivian millionaire who founded Brightstar, a global wireless distribution company based here. “The Latin economic boom in the last 10 years has led to the creation of a huge middle class in countries like Brazil, Peru and Colombia, and they look at Miami as the aspirational place to be.” The transformation, the latest chapter in the city’s decades-long evolution, is especially apparent amid the building cranes, street life and nightclubs downtown. But it is seen across Miami-Dade County, where highly educated South American immigrants and second-home owners have increasingly put down roots and played a major role in jump-starting a region that not long ago was ravaged by recession.

Their relative wealth has allowed them to ramp up businesses like import-export companies and banks, and to open restaurants that dish out arepas from Venezuela, coxinhas from Brazil and alfajores from Argentina. Partly as a result of that influx, the Miami-Fort Lauderdale region eclipsed Los Angeles in 2012 as the major metropolitan area with the largest share — 45 percent — of immigrant business owners, according to a report by the Fiscal Policy Institute, a research group.