VermelhoRed
Prince
Argentina has a better case than Brazil in my opinion (being neither Argentine nor Brazilian). Brazil got in on the strength of being an increasingly relevant modern economy, yet its economic power is still below that of Canada (not included as a civ, and I consider deservedly not). Argentina (as the United Provinces) arguably has a longer history of regional dominance in South America. On the downside the major option for a leader - Roca - would not be a good choice due to his ostracisation in modern Argentina, due to the campaign of extermination he led against indigenous peoples.
What are you saying? Argentina lost every war against Imperial Brazil! The only time when they were arguably more powerful than Brazil was early 20th century.
It seems evident from the stereotypical UA (Carnival) given to Brazil that the designers were struggling to justify its inclusion, and they've admitted it was included because of fan pressure, suggesting that the designers didn't necessarily find it inherently worthy or interesting.
They chose that UA because they needed a tourism-related civ. It wasn't very fitting of Brazilian history, but gameplay comes first I guess. I would prefer something that reflect Brazil as an exporter of plantation luxuries....
And I need to see where they mentioned specifically only because of fan pressure.