Final answer:
The World War I-era poster likely represents the concept of total war, where all civilian and military resources are mobilized towards the war effort, as part of a broader propaganda campaign to engage society in the conflict.
Step-by-step explanation:
Analyzing a World War I-era poster, and understanding which characteristic of the war it represents, involves considering various aspects. In this scenario, without the visual, one can still deduce the likely characteristic based on the context provided. Propaganda posters from the time often depicted the mobilization of society and the economy for war effort, which represents the concept of total war.
Total war signifies that not only military but also civilian resources were mobilized towards the war effort, and all aspects of society were expected to contribute to the victory. This involved a level of societal engagement and government control over economies, resources, and information that went far beyond anything seen in earlier conflicts. Propaganda played a key role by shaping public opinion and encouraging widespread participation in the war effort.
Therefore, the given World War I poster is most likely an example of total war, as it would have been part of a broader propaganda campaign designed to mobilize all segments of the population and economy towards the war effort. It is unlikely to represent imperialism, trench warfare, or the alliance system directly, though those were also significant aspects of World War I.