Looks like foreign workers didn’t perform as promised.
“Since June 2009 Americans have lived in the false reality of a recovered economy. Various fake news and manipulated statistics have been used to create this false impression. However, indicators that really count have not supported the false picture and were ignored.
For example, it is normal in a recovering or expanding economy for the labor force participation rate to rise as people enter the work force to take advantage of the job opportunities. During the decade of the long recovery, from June 2009 through May 2019, the labor force participation rate consistently fell from 65.7 to 62.8 percent”.