Imagine what would happen if a prosperous Western nation threw open its borders, allowing immigrants to flood in virtually unchecked. Soaring unemployment, overstretched social services, rising crime, even rioting in the streets? Not in Spain.
Over the past decade, the traditionally homogeneous country has become a sort of open-door laboratory on immigration. Spain has absorbed more than 3 million foreigners from places as diverse as Romania, Morocco, and South America. More than 11% of the country's 44 million residents are now foreign-born, one of the highest proportions in Europe. With hundreds of thousands more arriving each year, Spain could soon reach the U.S. rate of 12.9%.