Isn't Brazil in America?
Perhaps someone from Americas - America can comment how common this is in their country?
As a first approximation using Google Translate, American translates as americano in both Portuguese and Spanish, while Mexican and Brazilian, for example, translate as mexicano and brasileño (Spanish) and brasileiro (Portuguese), respectively. I didn't find a way to limit this to particular locales as would be appropriate. These types of things can be subtle, and I'm interested to hear from good sources that can provide more insight.