The quote isn't irrelevant to the comment I was responding to, it was an example of its usage hundreds of years ago, loooong before Hollywood. Like I said above, it's a historical artifact, not some brazen attempt at linguistic hegemony.
(Sorry, but the Americas is what the continents are called normally - in English at least - did you just make up a new rule? There's even a Wikipedia entry: https://en.m.wikipedia.org/wiki/Americas)
Regardless, the name for Americans isn't changing any time soon, so I wouldn't get worked up about it. Besides, we are Americans in the most pedantic use of the term - if the Canadians, Mexicans and anyone else in this hemisphere wants to call themselves Americans too, they can go right ahead. They'll just seem petty and silly though.