A "D. Direct Democracy" is not an authoritarian form of government since in this form of government the people are in control, not a specific ruler or elite group.
It lacked bill of rights to protect individual freedom.
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The vast Persian Empire contained many conquered peoples with different beliefs and cultures, while the Greek civilization consisted of independent city-states that all had their own beliefs.
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A term coined by Raphael Lemkin in his 1944 book Axis Rule in Occupied Europe. Likely based off of the Holocaust and his personal experience with the Armenian massacres