So we have a poster saying there was no slavery,
& other posters saying that working for a low
wage is slavery. The widely varying personal
definitions are making it nowhere or everywhere.
There are definitions of modern slavery produced by government, and somewhat consistent internationally.
Then there is 'traditional' slavery in many people's eyes (chattel slavery).
Worth noting that in Australia we have never had formal chattel slavery, but even in the 1800's some of the extremely dubious practices around indentured labour (mostly aboriginal or imported from Asia) was being described as slavery.
I wonder if this has an effect on what is seen as slavery, in that the process of chattel slavery in the US was very much a commodity market, whereas in Australia it was less regulated and in the open. Not sure.
In any case, chattel slavery of the sort seen in many countries three hundred years ago is different to the majority of modern slavery in prosperous countries.
In case you missed it, a US definition...
PS. Worth noting, US historical slavery is widely denounced (rightly so).
Australian historical slavery is widely ignored. But we are definitely living in a glass house.