Why did the new nations of Europe reach the blink of war many times?

The new nations of Europe often reached the brink of war due to a combination of unresolved territorial disputes, ethnic tensions, and nationalist aspirations. The aftermath of World War I and the Treaty of Versailles left many borders contested and minority groups feeling marginalized. Additionally, the rise of militaristic ideologies and economic instability contributed to a climate of aggression and competition among these nascent states. These factors, coupled with the failure of international diplomacy, frequently pushed nations toward conflict.