So we've come to the difference of opinions, which is that your definition of slavery excludes those convicted of a crime, while others' doesn't. Not a very interesting point to debate on.
Do you know about black codes? I brought up the "who decides who criminals are" because it starts here: https://en.m.wikipedia.org/wiki/Black_Codes_(United_States)
Again, not comparable to chattel slavery, but related enough that it links to the page for chattel slavery in the first paragraph.