Migrant workers often can't register in the cities where they work, and subsequently can't qualify for social services such as public education or social security.

CNN: China's workforce at a crossroads

Put simply, immigration will always be high because British people won't do the jobs migrant workers do.

BBC: In full: David Cameron immigration speech

Hundreds of migrant workers toiling in the South won't be called north this year.

WSJ: Spring Is No Bowl of Cherries for Michigan Growers

If one hundred migrant workers come into the country, they don't simply displace job opportunities for a hundred British citizens.

BBC: In full: David Cameron immigration speech

He grew up in a migrant farming family and picked vegetables and fruits in California when he wasn't in school.

MSN: Discovery's eclectic crew is poised for space

"People coming here to work in factories don't have the time or the money for shopping or the rollercoaster, " said a migrant worker in his 20s, surnamed Xiao, who works at the mall.

CNN: World's biggest mall a China 'ghost town'

He didn't have to travel far from his home in Minneapolis to find a camp where Hispanic women, migrant workers in food-processing plants, have temporary quarters.

WSJ: A WPA Project Retooled | More American Photographs | Wexner Center for the Arts | By Richard B. Woodward