Which of Charlemagne's actions continue to affect civilization today?

Charlemagne's actions significantly shaped European civilization, particularly through his promotion of education and the Carolingian Renaissance, which laid the groundwork for the revival of learning and culture in the Middle Ages. His establishment of a centralized government and legal system influenced the development of modern nation-states and governance structures. Additionally, Charlemagne's role in the promotion of Christianity helped to unify Europe under a common religious framework, impacting the continent's cultural and social development. His legacy is evident in the continued importance of education, governance, and the intertwining of religion and politics in European societies today.