Field workers pick strawberries in Oxnard, California, April 16, 2013. In California, laborers from Mexico and Central America help make it the No. 1 farm state, with over $43 billion in cash receipts in 2011. The state also supplies some 85 percent of the country's strawberries, and no place is more abundant in that crop than Oxnard, 60 miles (100 km) west of downtown Los Angeles. Crews stoop in the green rows that stretch over the flat plain, plucking the red fruit with swift flicks of the wrist.  REUTERS/Gus Ruelas (UNITED STATES - Tags: BUSINESS EMPLOYMENT AGRICULTURE SOCIETY IMMIGRATION) - RTXYOHF
iGus Ruelas/Reuters

David Frum