Mostly, I see 'yankee, yanqui, gringo' used to refer to United Statians (Unitarians? The U.S.S.R. had it so much better--'Soviet' sounds cool) by peoples south of Texas. And I HAVE heard persons north and south of yankee borders referring to themselves as 'Americans' on occasion. I guess it would be if some patch of land in the east hemisphere started calling themselves The Grand United Kingdom of Europe and assuming all 'European' stuff referred to them.