The Europeans were slaves to the Ottoman Empire; the Jews were slaves to the Egyptians. Slavery goes back 3500 bc. Currently 11 million Cubans are slaves to the Castro dictatorship. Blacks were sadly slaves but this has been a human problem- unfortunately.
I don’t know if I would say there’s a massive difference. Slaves are so against their will indentured agree to serve based on some terms. I wonder if they had other choices what option they’d take. Slavery by another other name is still the same. 
