Earlier quoted context omitted.
> Human trafficking is just another word for illegal immigration. No, it's not, because human trafficking can occur without crossing an limited-migration border. As usually used, it's very close to the union of de facto slavery and sex work. (To be fair, those categories have significant overlap, but there's a lot of push to include the parts of the latter that aren't the former within the reach of of the term.)
You mean there are people being "human trafficked" in their countries of origin? Can you provide an example?
Yes; there are also people who are legal immigrants who are trafficked only after arriving legally (immigrants, even legal ones, are often a vulnerable population.) And, even when illegal immigrants are trafficked, that is also often post-arrival, not part of how they can immigrate.
> Can you provide an example?
The one that is most frequently features in media reports is domestic sex trafficking of underage girls; but there is a lot more (surprisingly good coverage of a lot of variations is found, for now, on Wikipedia's page on trafficking in California [0], which is flagged for excessive detail.)
[0] https://en.m.wikipedia.org/wiki/Human_trafficking_in_Califor...