The practice of owning people and forcing them to work without pay.
Slaveries are very bad and unfair.
Examples:
Many years ago, there were slaveries in the United States.
Slaveries have been abolished in many countries.
Slaveries have caused a lot of pain and suffering.
The history of slaveries is a dark and shameful one.
Slaveries robbed people of their freedom and dignity.
We must never forget the horrors of slaveries.