The article reflects on the tumultuous period between 1914 and 1945, during which over 100 million people lost their lives to violent conflicts, including the First and Second World Wars and the Spanish flu. This era is depicted as the bloodiest in human history, underscoring a profound need for change in international relations. In its aftermath, nations learned important lessons that led to the establishment of various international organizations, such as the United Nations and regional alliances like the EU and MERCOSUR. These bodies were created to promote peace and cooperation, although they faced challenges in enforcing their decisions due to bureaucratic complexities and the need for lengthy negotiations.