The quote illustrates the collapse of expected deterrents to war, such as alliances among socialists and economic interdependencies. These factors were thought to create a barrier to conflict; however, when the moment of crisis arrived, they proved ineffective. Instead, a powerful sense of nationhood emerged, overriding previous safeguards against warfare.

This indicates how deeply ingrained national sentiments can unexpectedly take precedence over economic and social arrangements designed to maintain peace. Tuchman's work emphasizes that the emotional and political forces of nationalism can disrupt the frameworks that were believed to ensure stability and prevent war.