One thing that remains a constant is that if you oppress a people long enough, they will inevitably rise up against their oppressors.
Humanity as a race, never likes to be told what to do, they would rather be asked.
However those who crave power will always try to test the limits of what the people will find acceptable.
Something that has always remained true, is that when the people feel they are being abused, they will revolt on the abusers.