There should be a visa category or green card pathway for skilled tradespeople (journeyman or higher) looking to come to USA legally.
These people do not have a 4 year degree, but have 4 years studying their chosen trade. Currently, there is no pathway for a visa other than spousal or transfering within a company to come to the USA.
With the creation of many more domestic jobs, this would add knowledge and experience into the workforce and fill empty positions with those eager to move to the USA legally.