I'm sure we've all deeply missed stupid shit like this.
At the core of it Trigger is right of course. "America" or "Americas" is the combined land masses of North and South America. I think dividing America into two separate continents is largely a social and cultural concept, much like the division of Europe and Asia into separate continents although one can walk from Portugal to China. The combined land masses of Europe and Asia is called "Eurasia" by the way.
Referring to any one nation as "America" is technically wrong. The country in question is called The United States of America, U.S.A. for short. Or the U.S. Or "The United States". Or "The States" if you're a jerkoff, but calling it America should be technically wrong. Nevertheless it is done all the time by everybody, especially when defining descent or origin (like "he's an American citizen" or "they're one of the greatest American bands"). Therefore, if one writes something like Solar Eagle is one the greatest bands from America it will probably sound like one thinks they were actually from the United States. Some wise ass is sure to be at your throat the next second so it's betterto be clearer.
In short: Nothing to argue about. We better argue which rarities are grossly overrated, who's a collector or a metalhead, if W.A.S.P. are real metal or not and last but not least who's a dumb.