No qualified applicants, or no qualified applicants willing to work for $15/hour?
Bingo.
There are NO jobs where there isn’t a qualified American that can do it. We’re a country of 330 million people with by far the best higher education system in the world. H1B exists solely because companies want to suppress wages. Claiming that you can’t find qualified workers in America is BS, they’re there but they won’t work for peanuts. H1B’s end run the capitalist free market in labor, it’s surprising so many so called conservatives support that.