To get a quick sense of the way Nozick argues, here's a famous thought experiment from the book.

Curious. My first thought was "Since the author seems to be abusing emotional connotations to make his point, what is the most subversive position about this thought experiment that I can still defend? " And my answer is, it is possible to frame the very first situation in terms of non-slavery, simply because the master is so far above the slave that it's borderline meaningless to attribute him agency. You might as well call humans slaves of chance.