Diamond’s main theme in Guns, Germs, and Steel is that the advantage of one society over another is not based on race or intelligence as some historians have claimed but instead on geography. Certain favorable aspects of local geography allow a group of people who live in that area to more easily produce food. As these people learn to farm the land and raise specific crops rather than forage for them, they find they have more time for other activities. They create rules that benefit their existence, designate certain members to focus on tasks beyond those of pure survival, and thus set up complex societies. From this advantage over the basic nomadic lives of hunters and foragers, the more stabilized and organized communities emerge as conquerors. Diamond asserts that one group of people is not more intelligent than another but rather that the more successful group lived in an area whose environment provided for cultural advantages. In other words, those who lived in more fertile areas, such as around the Mediterranean, as opposed to those who settled in the Arctic area or in the African Sahara, had a much greater chance of success.
Diamond also focuses on the opposite side of his major theme. Instead of concentrating just on how and why societies succeed, he explores why societies fail and how those failures become permanent if certain environmental conditions are not met. Societies that are forced to be hunters and gatherers because of the geography in which they live will always be at a disadvantage. Another condition that marks a group of people for failure is the inability to create a sufficiently dense population. This might be due to an unfavorable climate or to an insufficient supply of essential raw materials. A successful community also needs to be able to domesticate crops and animals; without doing so, the community will never progress to the next...
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