Immigrants spend money and grow the market for goods produced by native-born Americans.
All these things are good for domestic labor. There is no reason to believe immigration is bad for American workers. Not everything is zero-sum, and that's basic economics.
You realize the courses don't stop at basic, right?
It is well-established that immigration (legal and otherwise) is good for the economy overall. Skilled immigrants are good for US businesses.
https://kentclarkcenter.org/surveys/permanent-residency-rule...
Immigrants start businesses at twice the rate of native-born Americans.
https://www.congress.gov/118/meeting/house/116727/documents/... (page 1, though the citation has gone down the memory hole)
Some immigrants are complementary to native-born American workers rather than being in competition.
https://www.stlouisfed.org/publications/page-one-economics/2...
Immigrants spend money and grow the market for goods produced by native-born Americans.
All these things are good for domestic labor. There is no reason to believe immigration is bad for American workers. Not everything is zero-sum, and that's basic economics.