Some areas of the world developed independent food production more quickly than others. Why should Diamond be concerned with this subject?
From Guns, Germs, and Steel by Jared Diamond
Also part of the question is what relationship does this have to his argument?
Diamond is concerned with this topic for two reasons, both of which have to do with his argument.
First, he wants to know who developed independent food production because this society would have a head start towards becoming developed. A society with agriculture would be able to start to develop the technology and the germs (the germs would develop themselves) that would help them become dominant. This relates to his argument because he would argue that those who develop this first would be more likely to become powerful.
Second, he needs to find out why these areas developed it more quickly. This is because he wants to know why certain areas became dominant. If they developed food production because they were culturally better than other places, that would be important. If they developed it because they were lucky, that would be important too. Since he is trying to talk about why Europeans came to dominate the world, it is important to answer this question.
In his book Guns, germs and Steel Diamond is primarily concerned with he question why people in different parts of the world developed differently and have different histories. Further, Diamond believes that one of the main ingredients of events like conquests, epidemics, and genocides, which have played an important role in shaping of history of the modern world,has been development of agriculture. In this way Diamond has been deeply concerned with how some areas of the world developed independent food production more quickly than others.
Diamond has tried to show that differences in development of agricultural practices in different regions, were not because of any inherent differences in intelligence of the people, but because of combination of many naturally occurring advantages. These advantages include existence of suitable wild crops that could be cultivated by farming, existence of animals suitable for domesticating, and availability of vast tracts of land with similar climates and minimal barriers to spread of people and technology.