This undated photo provided by the United States Citizenship and Immigration Services' (USCIS) History Library and the National Trust for Historic Preservation, shows workers waiting in line to be contracted at the Rio Vista Farm Reception Center in Sacorro, Texas. During peak times at Rio Vista Farm, up to 1,500 men signed short-term labor contracts to assist with labor shortages across the country. (United States Citizenship and Immigration Services' (USCIS) History Library/National Trust for Historic Preservation via AP)
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