Estadunidense

What you should realize is that these two users are Brazilian leftists, trying to defend the spread this word via Wikipedia. Wiki-PT have a large influx of communists, socialists and left-lists using your structure for spreading ideological ideas (articles of politics at Wiki-PT are a disgrace, totally advocate a political vision and always attack the other), and of course, they come here as well. Any Brazilian acquainted in politics (few people) know that the word "Estadunidense" is used only for fanatics anti-US or ignorant who do not know the political meaning of this word, and just talk because they read somewhere. You will not find this word in any common and serious Brazilian media, only radical blogs and a few media organizations that have strong links with the left.