> Were sweatshop workers in New York City free? Ranch hand employees out west? Chinese railroad workers in the USA?
Slaves were definitionally not free under the law - their bodies were property of masters, just like farm animals were. If those slaves escaped their owners, they were legally allowed to be hunted down and returned.
That is a fundamental difference than the sweatshop, railway, or other workers, even though those workers were also abused by their employers. They still had the option to walk away, even if it meant accepting the destitution as a result. Lots of them did walk away and starve. Some toiled away as workers generation upon generation. A few went on to build great wealth and influence, as is evidenced by the rise of the early industrialist families of the United States.
> Are starving workers freer than well fed slaves?
Absolutely, and that doesn't excuse a system that lets free workers starve, just as a full stomach does not excuse the enslavement of humans.