How has a nation of 4.5 million people become 'Rugby Country'?

New Zealand is arguably the greatest rugby-playing country on the planet, but does the sport sum up much of what it means to be a New Zealander? After the game was founded toward the end of the 19th century in England, rugby slipped seamlessly into New Zealand alongside the settlers. Desmond Wood has explored how the country has maintained its status at the top of world rugby.