Brazil
Brazil, that's is the only one, at least officially
Brazil is South America's largest country and has an exquisite \portuguese cuisine.
Brazil is both the highest populated and largest country in South America.
Brazil has the largest Portuguese-speaking population in South America.
Brazil is the largest Portuguese speaking country in the world and is located in South America.Brazil is the one country in Latin America whose main language is Portuguese.
Brazil is the largest Portuguese-speaking country in the world. It is also the largest country in South America by land area and population.
Brazil has the largest Portuguese-speaking population in Latin America.
Brazil, the largest country in South America, is a Portuguese speaking country.
Brazil, as the largest country, has the most population.
Brazil is both the highest populated and largest country in South America.
Latin America actually includes the Caribbean; and Central, North and South America. North America is included, because that's where Mexico is. Brazil is the only Portuguese-speaking country in South America. There are islands in the Caribbean where Portuguese is spoken, such as Curacao and Dominica.