They had in mind to protect people. There was all types of power sharing that were done to have different groups of power control and balance each one another.
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Villages needed to organize governments. is your best answer
Note that food surpluses means that there is extra food, which means that:
1) the population would increase, not decrease
2) there are more time to create tools, and possessions and other needed things can be kept longer
3) If you hunt and gather more, it would just result in more surpluses.
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The result is, Native Americans were eager to use the railroads for travel.