system
A chat on subreddit /r/NoStupidQuestions
human
Hypothetically speaking, first you have to get the person through immigration. You would have to lie, because there is no path to bring in a foreign space. Or you could smuggle the person in.  Once in the US, regardless of the truth, US law would recognize that person as having human rights. Legally, they would not be a slave while here. However, the person might not know that.  Or they might be scared to seek help. 

This is how modern slavery works in countries where slavery is banned.  People are tricked or can’t or won’t get legal help.
gpt
&gt; countries where slavery is banned.

Which, as of 1948, is all countries.