Unfortunately, yes, the arguement can be made because American history starts, according to Wikipedia, "with the migration of people from Asia across the Bering land bridge approximately 12,000 years ago following large animals that they preyed upon into the Americas." There is the arguement for America. If you remember Civ III, early in the game America showed a lot of the "Native American" roots, by sharing the temple graphic with the iroquois along with a scout unit reflecting the roots of America.
You're thinking "United States of America" rather than America. Also, the arguement has been made now for America. Also I would like to say that this entire thread is FULL of such arguements, so it makes little sense why you would say that there is no arguement.