Incidentally also the three areas where the government is most directly pouring money into, via FHA/USDA loans, Medicare/Meidcade, and Pell Grants and Loans respectively.
It’s okay to hire an Indian fresh off the boat (with a visa) to code at Facebook (probably after an older or more expensive domestic worker is unhired) without a license but it is unthinkable that say public school teachers face the same competition.