In this Jan. 31, 2012 photo, a farm worker carries heads of romaine lettuce in the lettuce fields near Holtville, Calif. Thousands of Mexicans leave their homes each morning to become a pillar of one of most unusual and depressed labor markets in the United States. California&#x27;s Imperial Valley consistently registers the nation&#x27;s highest unemployment rate - 26.4 percent in January - yet it looks south of the border to fill many of its jobs because locals shun $9-an-hour jobs picking crops. Mexicans enter the country legally each morning and return home each night. (AP Photo/Gregory Bull)
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