When you water your neighbors plants and neglect yours, what happens?
They turn to weeds or die, don't they?
Isn't that what we are doing with these guest worker programs to our own citizens when we have more workers than we do jobs?
This data comes from https://www.bls.gov/oes/tables.htm
I simply added charts to the data so that you could visualize what is happening to our occupational groups here in America over the last 20 plus years.