Because it gives us more information by which to interpret things that have happened more recently.
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Pre-history, or pre-historic (Obviously!)
Pre-historic
Pre history is something that hasn't happened yet and you will have to wait for it.
Oh well i was in 7th grade. You learn about pre algebra and quotes. You also learn about sports. You learn about the medival ages And Islam (boo). We learn life science and sexual edu. It stinks
Anything earlier than about 3000BCE is pre-historic, and there's darned little "history" earlier than about 1,000BCE. Since our best guess is that the human race "began" - in the sense that anything before that was pre-human - in about 150,000 BCE, then "pre-history" lasted for about 147,000 years.