How does Ward's description of the Roman government compared to Polybius' description and Millar's description?

According to Millar, he said there were 3 institutional powers: The first was the residual function of the Legislature to serve as criminal courts. The second was the dissolution of either the Generation Assembly or the Tribal Council. The fourth one has been able to legislateExplanation:

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the northwest ordinance of 1787 guaranteed basic rights for settlers and banned slavery there.