World War I marked a significant transformation in warfare, where the concept of total war emerged. This meant that the conflict wasn't limited to battles between armies but encompassed entire societies. Industries, economies, and civilian populations became integrated into the war effort, blurring the lines between military and civilian targets.

Niall Ferguson's exploration in "The Abyss: World War I and the End of the First Age of Globalization" highlights how the war's impact extended beyond the battlefield. It shaped societal structures and global relationships, indicating a profound shift in how wars are conducted and experienced, laying the groundwork for future conflicts.