5

Between 1942 and 1964 the U.S. had a "guestworker" program which resulted in 4.5 million individual contracts with Mexican laborers.

On June 6, 2001 Presidents Bush and Fox designated a top level team to design a new guestworker program in order to address the "migration quandary". Nothing came of it.

Economist Alan Greensberg and George Soros insist the U.S. economy can not grow without a substantial inflow of bottom-rung immigrant workers.