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Prehistory is a term for the extensive time period before humans created writing systems. It is thought to have lasted from 2.5 million years ago, with the earliest hominid tool use, until 3,600 BCE, when ancient Mesopotamians developed writing.
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Ancient history covers all continents inhabited by humans in the period 3000 BCE – 500 CE. The three-age system periodizes ancient history into the Stone Age, the Bronze Age, and the Iron Age, with recorded history generally considered to begin with the Bronze Age.
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The middle ages is characterized by wars, instability and fragmented power structures. The number of castles built in the middle ages isn't known but it is certainly more then 10,000 and possibly more than 100,000. For example, there were around 25,000 medieval castles constructed in Germany alone
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Renaissance is the name given in the 19th century to a broad cultural movement that occurred in Western Europe during the 15th and 16th centuries. It was a period of transition between the Middle Ages and early modern times. -
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The Modern Era lasted from the end of the Middle Ages to the middle of the 20th century; modernism, however, refers to the artistic movement of late 19th and early 20th centuries that arose from the widespread changes that swept the world during that period.
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The Contemporary Age is the historical stage that runs from the French Revolution (1789) to the present. This period is characterized by events such as the industrial revolutions, the two world wars, scientific and technological advances, and the establishment of a capitalist economy.
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