In arguing that current patterns of immigration hurt the american economy in his 1996 article "the new economics of immigration: affluent americans gain: poor americans lose," what did harvard economist george borjas emphasize

George Borjas Emphasize that the low work and education skills of most immigrants. He create this emphasize based on the fact that whenever flow of immigration left uncontrolled, it will took all the job opportunities for lower and middle class (mostly hard labor) , which definitely could be seen as a loss for 'poor people'