The Achaemenid Empire (558–330 BC) of Persia, popularly referred to as the Persian empire, was a monarchy. It was ruled by a single hereditary leader, who considered himself divinely authorized to hold absolute power.
The Persian empire was a model of efficient ancient administration. The monarch appointed satraps as regional leaders, and delegated power in a way the preserved sufficient local autonomy to prevent most (non-Greek) subjects from wishing to revolt. It had an efficient system of roads and messengers, allowing rule over a large geographic area, and a regular system of taxation that established it on a sound financial footing. It also had a complex and uniform law code.
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These processes are associated with large-scale movements of the Earth's crust (tectonic plates). Folding, faulting, volcanic activity, igneous intrusion and metamorphism can all be parts of the orogenic process of mountain building.
They are examples of culture and ethnic deferences
