Whose national sport is football?

Answer 1

That depends entirely on which code of football you are referring to. Only fourteen countries have a legally defined national sport, and none of these countries have any code of football as their national sport. The list can be found [http://en.wikipedia.org/wiki/National_sport#National_sports_defined_by_law here]. Rugby Union (with rugby technically being a code of football) is the de facto national sport of New Zealand, while Rugby League (also a code of football) is the de facto national sport of Papua New Guinea. They are the only two countries who have a de facto national sport which is any code of football. However, the various codes of football remain popular in many other nations, but the popularity is simply not recognised officially.

Answer 2

It is the United States. It originates from rugby