"It was our idea to create a homogenous population, " says Mellberg.

BBC: The Apprentice: A lesson from Sweden

The situation in Japan was much the same: a country with a disciplined, homogenous population, no allies, sealed borders, its cities half burnt, more than three million dead, a million wounded, missing, or captured, its revered emperor having capitulated, and nearly half a million troops in occupation.

WSJ: Our Blindness

In 1980, Phoenix was one of the more homogenous cities in America, with few blacks and Hispanics accounting for just 15% of its population.

ECONOMIST: Immigration