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Ghana left salt slabs, and other Empires left what they thought was a good amount of gold. It was very peaceful, and there were no arguments.
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They learned how to use iron and how to use it as tools for farming. They also herded cattle for meat and milk. Because of this, their population grew more and more.
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This was good because it made the rulers gain power. They got lots of good items for an empire like iron and wheat. This was good so they could increase in population and they made weapons that were better than nearby people or countries.
