How can America have a capital city when America is a continent?
Yes, 2 separate continents, so Brazil and America have nothing to do with each other and America is part of a continent, North America. Canada is part of North America, and it is bigger in size than America. So America is just a country on a continent with more than 1 country. It is a regular country. The only continent with a capital city is Australia, but technically it is a country too.
