Unformatted text preview: systems expressed advancements in civilization. Not only did it show that people had the ability to build things with no tools, only using things of nature and natural strength, but it also showed just how smart the people actually were. If it weren’t for food, there would probably be no trade or irrigation systems. This would mean that there was no use for a governmental or power system....
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- Winter '10
- History, key factor, long line, irrigation systems