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  began about 9.000 B.C. to the invention of writing about 3.000 B.C. human beings lived from agriculture and cattle raising.
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  It is the period that starst with our first ancestors,the prehistory finish because of the first writing
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  It was the finish of the prehistory and the beginning of the history
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  Was very important this event.It was broken because there was a lot of military spending, divided empire and invasions of barbarians
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  Starts on 1492 and finish the 1789,in this event ocurred the french revolution
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  columbus discovers America and it was the end of the middle ages
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  began about 7.000 years ago,use metals to make objects
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  it begins about 9.000 B.C they live from hunting,fishing and gathering wild fruit and were nomadic