Historically, what was the Church's position on Slavery?

Historically, what has been the Catholic Church’s stance on any type of slavery? If the Church supported it…why?
I ask this because I’ve been caught off guard by a person who says the Catholic Church supported slavery in the past and that the church is only against it now to make up for their mistakes in the past.

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**Recommended Reading:
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*]Couldn’t the Church change its mind about homosexuality?
*]Catholic Response to Slavery
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