H-2A Nonimmigrant Visa Program
"The H-2A program allows U.S. employers or U.S. agents who meet specific regulatory requirements to bring foreign nationals to the United States to fill temporary agricultural jobs."
"After farm employers and foreign workers become dependent on each other, the farmers do not think about alternatives to H-2 workers, and the migrants need U.S. earnings to maintain their families. Guest worker programs have failed wherever and whenever they have been tried. The indicators of failure are that some migrants settled, illegal migrants accompanied legal migrants, and the programs lasted longer and got larger than anticipated. Some level of failure can be expected when governments attempt to regulate a relationship in which migrants and employers have different goals than regulators."