Well ancient Greece was an oligarchy (kind of like a democracy). Greece has City States, as well as Ancient Mesopotamia. Mesopotamia had kings though, but was ran like an Oligarchy.
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Lincoln probably made so many referances to the American Revolution because of the Civil War at the time considering that the South wanted some sort of independance from the North because they thought they needed slavery and the American Revolution was so that America could become independant and not be ruled by Britain anymore, so that is why he probably referred a lot to the American Revolution.
Answer:
The issuance of the Emancipation Proclamation
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