There are 6 counties that consider the great game as "a national sport" ; Fiji, Georgia, New Zealand, Samoa, Tonga and Wales.
England is the birthplace of the game of Rugby
Rugby union, or more specifically, rugby sevens.
for which country?
The international governing body is the International Rugby Board, and the national body will be the country's rugby union. e.g. the national governing body for England is the RFU.
no its rugby
Rugby is the popular game, because there is no national game. Due to it being a multicultured Continent.
New Zealand, Wales, Samoa, Fiji and Tonga are Countries that have Rugby Union as there National sport.