Why was slavery was prohibited in the northwest ordinance?

protected civil liberties and outlawed slavery in the new territories.

the answer is false.

polisit can also mean a body of citizens. in modern historiography, polis is normally used to indicate the ancient greek city-states, like classical athens and its contemporaries, and thus is often translated as "city-state". the body of citizens came to be the most important meaning of the term polis in ancient greece.