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"Polis" is the Greek word behind the English word "political." It is most often translated "city-state." The City in ancient Greece was often an independent State. It was also wholly religious, not "secular" as states today purport to be.
For more on the polis see here. For Biblical grounds to equate "Kingdom" and "Polis" see here.
Because man is created in the Image of God (see Kline above), man is qualified/commanded to build God's Messianic Kingdom on earth.