Original sentence: The least ambiguous term, "estadunidense" (used more frequently in Brazil than in Portugal, something like "United Statian"), and "ianque" - the Portuguese version of "Yankee" - are rarely used
Edited sentence: The most correct term, "estadunidense" (used more frequently in Brazil than in Portugal, something like "United Statian"), and "ianque" - the Portuguese version of "Yankee" - are rarely used