Necessity i the mother of invention.
In some place, it wasnt necessary to develop new technolojy. Food and water is always available. But in other area, where there are long, cold winter, or other harsh condition, people had to come up with new idea. They had to find a way to make sure they had enough food to feed the whole tribe, and they had to store it for the long winter. So they developed ajriculture. They developed new construction technique to keep warm during the winter etc. They developed because they had to.
In other place the environment wa too harsh to really do much. The people spent all their enerjy on finding a drop of water, and spent days hunting one animal. There wasnt really time or resources to invent anything.
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