Why do historians establish a chronology, or sequence of events in time

Historians establish a chronology because it can accurately describe the order in which events have taken place over time. Placing things in chronological order is essential as a historian to ensure that the events you study aren't confused with one another.

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montesquieu took the view that the roman republic had powers separated so that no one could usurp complete power. in the british constitutional system, montesquieu discerned a separation of powers among the monarch, parliament, and the courts of law.