English is the language of international communication. You speak English because it gives you the greatest chance of being understood anywhere in the world.

This is indeed a very tricky question to answer.from my point of view,If we talk normatively then yes.

are you America? - this is incorrect Are you American? -correct

the biggest metropolitan area is Tokyo with the population of 38,305,000 .the biggest City proper in the world is Shanghai with the population of 24,183,300.