Because time is a social construct. It was only created when civilization was created. Since there was no one to create time in the beginning of Earth we had to create it as far back as we could. So basically science as stuff created time to help people. Time wasn't a thing back then. It only became a thing when people became a thing.
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It would cause erosion by washing away the soil into the ocean
The federal government wanted to assimilate and introduce the natives to the American way of living and to integrate them into the society.
