The name of the nation isn't solely "America" but the "United States of America". It's also redundant to say the country is "America" but the continent it belongs to is North America and in turn the latter belongs to the Americas, thus creating a vocabulary paradox. Just because the country is referred by the third part by the majority of its name it doesn't mean it constitutes a valid reason to redirect an ambiguous name to solely one nation its part of strictly speaking. After all, by all technical standards Canada, Mexico, Brazil, and Cuba are all American nations as the USA is, and that's without using prefixes such as "latin-/south-/franco-/native-/meso-/etc".