How did christians justify slavery through the bible?

The Bible mentions somewhere something about "Serving your master." In addition to "Receiving an award."

Christians justify slavery through the bible by taking when Jesus called them his chosen people, to mean that everyone else is their inferior and therefore put on the Earth by God for the sole purpose of serving the "chosen ones".

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c.) the country needed a stronger central government.

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

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