What is the significance of the theory of seperation of the 3 branches of gov?

NotreDame22

New member
I know what each does and all the stuff about that. I want to know why it would be significant for Montesquie to create a theory of seperation. Why would people want to go from having one ruler with all the power (a king or a queen) to equally seperated power with the 3 branches
 
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