Why do new nations of Europe reach the brink of war many times?

New nations in Europe often reach the brink of war due to a combination of historical grievances, ethnic tensions, and territorial disputes that stem from complex legacies of past conflicts and shifting borders. National identities are frequently contested, leading to rivalries among different ethnic groups seeking autonomy or recognition. Additionally, economic pressures and external influences can exacerbate these tensions, making conflicts more likely. This volatile mix can create a precarious situation where minor incidents escalate into larger confrontations.