Cf. Aristotle's Politics translated (full text)
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Such a programme for a treatise on government might lead us to expect in the Politics mainly a description of a Utopia or ideal state which might inspire poets or philosophers but have little direct effect upon political institutions. Plato's Republic is obviously impracticable, for its author had turned away in despair from existing politics. He has no proposals, in that dialogue at least, for making the best of things as they are. The first lesson his philosopher has to learn is to turn away from this world of becoming and decay, and to look upon the unchanging eternal world of ideas. Thus his ideal city is, as he says, a pattern laid up in heaven by which the just man may rule his life, a pattern therefore in the meantime for the individual and not for the statesman. It is a city, he admits in the Laws, for gods or the children of gods, not for men as they are.
Aristotle has none of the high enthusiasm or poetic imagination of Plato. He is even unduly impatient of Plato's idealism, as is shown by the criticisms in the second book. But he has a power to see the possibilities of good in things that are imperfect, and the patience of the true politician who has learned that if he would make men what they ought to be, he must take them as he finds them. His ideal is constructed not of pure reason or poetry, but from careful and sympathetic study of a wide range of facts. His criticism of Plato in the light of history, in Book II. chap, v., though as a criticism it is curiously inept, reveals his own attitude admirably: "Let us remember that we should not disregard the experience of ages; in the multitude of years, these things, if they were good, would certainly not have been unknown; for almost everything has been found out, although sometimes they are not put together; in other cases men do not use the knowledge which they have." Aristotle in his Constitutions had made a study of one hundred and fifty-eight constitutions of the states of his day, and the fruits of that study are seen in the continual reference to concrete political experience, which makes the Politics in some respects a critical history of the workings of the institutions of the Greek city state. In Books IV., V., and VI. the ideal state seems far away, and we find a dispassionate survey of imperfect states, the best ways of preserving them, and an analysis of the causes of their instability. It is as though Aristotle were saying: "I have shown you the proper and normal type of constitution, but if you will not have it and insist on living under a perverted form, you may as well know how to make the best of it." In this way the Politics, though it defines the state in the light of its ideal, discusses states and institutions as they are. Ostensibly it is merely a continuation of the Ethics, but it comes to treat political questions from a purely political standpoint.
Read Aristotle's Politics complete, translated by A. Lindsay
Reference address : https://www.ellopos.net/elpenor/greek-texts/ancient-greece/aristotle/politics-introduction.asp?pg=2