There is a potential for a billion of these "jobs Americans won't do". There is even a potential for a billion jobs Mexican illegals are unwilling to do.
If slavery were made legal, billions of "labor opportunities" would open right here in the US.
A "job Americans won't do" is a job that should be done elsewhere.
"We have 11 -12 million illegal aliens in the U.S. Today. We will likely have an additional 4 - 5 million before the border is secured. When these people become citizens, they will start bringing family members, which will add 20 -30 million more.
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Not to mention the fact that they breed like rabbits.