What was the subject of the book The Prince?

Machiavelli wrote The Prince to serve as a handbook for rulers, and he claims explicitly throughout the work that he is not interested in talking about ideal republics or imaginary utopias, as many of his predecessors had done: “There is such a gap between how one lives and how one should live that he who neglects what happenes

Explanation:

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bismarck believed in using force

is the correct answer!