Monarchy, political system based upon the undivided sovereignty or rule of a single person. The term applies to states in which supreme authority is vested in the monarch, an individual ruler who functions as the head of state and who achieves his or her position through heredity.
The last one, world war ll
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<h3>The Neolithic Revolution had a big impact on humans. It allowed people to stay in one place, which meant they were able to farm, cultivate crops, and domesticate animals for their own use. It also allowed humans to develop a system of irrigation, a calendar, plows, and metal tools</h3>
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