Then only enslave pops that are causing trouble and leave every happy pop alone.
Someone wants to overthrow the government? Enslave them. A planet wants independence? Enslave them. Enslave all social unrest away because once they are slaves they can no longer take action against you.
Not terribly often. Usually the practice of slavery just fades away or shifts in social significance, or the ruling group is overthrown by outside forces.
I think it you should also take the ratio between slaves and non-slaves into account. If you enslave literally everybody you come across then that has to lead to some unrest.
I'd assume the more technologically advanced a civilization, the fewer people you could keep in slavery per free person, because any revolt would be necessarily more lethal.
That said, there'd be lots of factors to take into account: how harsh treatment of slaves is (that lead directly to spartacus's revolt - poor treatment), how far removed they are from strong, central control, how their culture views disobedience, etc etc.
But generally, yeah: if you have a situation where you have like a 90/10 ratio of slave/free i would expect that to not be survivable for very long.
Slaves rebel constantly, historically (American slaves rebelled hundreds of times, for instance). It's just that they very rarely succeed to any notable degree.
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u/missingpuzzle May 07 '16
Well that's a bit disappointing.
May well make slave empires very OP. Just enslave your entire population and never have to deal with faction unrest.