a continent not a country

The Continent is not a country the Continent of America is made up of country like Canada we say Canadians Mexico we say Mexicans Brazil we say Brazilians so why do we here in the United States say  that we are the only ones hear on this continent to be called Americans we should be called United Statesians.So until next time my fellow United Statesians peace to all and may all be for peace.