Final answer:
The two parts of Barbara Ehrenreich's thesis in 'The Roots of War' likely relate to the inevitability of conflict among human societies and the role of economic factors in perpetuating war, based on historical patterns and sociopolitical analysis.
Step-by-step explanation:
Barbara Ehrenreich's essay The Roots of War posits a multifaceted view on the causation and continuation of war. According to the text excerpts provided, while the exact thesis statement from Ehrenreich's essay isn't quoted, we can analyze the reach of the ideas presented. The first part of the thesis could likely relate to the inevitability of conflict among human societies, as many of the references suggest that war and conflict are embedded in human history and arise due to various political, economic, and social factors.
The second part, given the economic themes presented in some of the references, might correspond with the role of economic factors in perpetuating war. This is evident when considering the thoughts of Ludwig Gumplowicz and Karl Marx, who discuss war and conquest as foundations of civilizations and the historical pattern of social change through conflict, respectively. The references also bring attention to the economic drivers of conflict, such as competition for scarce resources and the impacts of the illegal arms trade and drug trafficking.
Without Ehrenreich's original text, it is difficult to pin down her exact thesis. However, these two parts could encompass the nuances of war's origin, emphasizing both the cultural-historical inevitability and the economic factors that sustain conflicts over time.