How were nations like Spain Italy and German able to overcome tribal and clan conflicts over the centuries to become united countries?

Nations like Spain, Italy, and Germany overcame tribal and clan conflicts through a combination of political unification, cultural identity, and centralized governance. Key events, such as the unification of Italy under figures like Giuseppe Garibaldi and the establishment of the German Empire under Otto Von Bismarck, played crucial roles in consolidating various states and regions. Additionally, the promotion of a shared language, culture, and historical narrative helped foster a sense of national identity among disparate groups. Ultimately, economic integration and the establishment of common institutions further solidified their unity.