Does culture matter?

Does culture matter? Guns, Germs, and Steel addresses how western cultures came to dominate the world. In his text, however, Diamond seems to ignore why they would want to do so. Analyze the social and cultural factors that promoted European expansion and spread European culture around the world. Your discussion should include a discussion of World Systems Theory and the spread of European culture after 1400. Consider also whether Diamond's book would be better if he included a discussion of culture as well as geography (you may wish to consider Diamond's defense of his approach and the reasons why he thinks that culture is unimportant).