A historian who compares the expansion of political systems to the expansion of economic systems us organizing history by Theme.
A political system is a type of political organization that can be recognized, observed, or otherwise declared by a state in political science. It identifies how official government decisions are made.
An economic system is a way for societies or governments to organize and distribute available resources, services, and goods across a geographical region or country. Economic systems govern production factors such as land, capital, labor, and physical resources.
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