Modern world wars create complex dynamics on the global stage, making international society more connected and vulnerable to conflict. Since the end of World War II, numerous large and small scale conflicts have emerged, with profound impacts across the world. Worldwide Conflict in the 20th Century World Wars I and II were turning points in global history, redefining national boundaries, ideologies, and the world’s power structure. The ensuing Cold War gave rise to ideological competition between West and East, giving rise to regional conflicts and proxy wars in Asia, Africa and Latin America. The impact of this era is seen in the increase in nuclear weapons and the presence of NATO and the Warsaw Pact. Modern Tactics and Strategy The modern era brought changes in military strategy. The concept of hybrid warfare, a combination of conventional and unconventional tactics, has changed the way countries fight war. Clear examples can be seen in the conflicts in Ukraine and Syria, where the role of militias and information technology has been crucial. Additionally, the use of drones and cyber warfare has opened up new dimensions in combat. Globalization and Terrorism Globalization accelerates the exchange of ideas and culture, but it also exacerbates tensions between social groups. The emergence of terrorist groups such as ISIS creates new, transnational threats. Modern terrorism not only impacts locally, but also influences the foreign policies of major powers and changes the way countries come together to combat extremism. Economic and Social Impact Large-scale conflicts cause refugees which creates humanitarian crises. The economies of countries involved in war are often shaken, exacerbating poverty and social instability. For example, the war in Yemen is resulting in one of the largest humanitarian crises, with profound consequences for regional stability. The Role of International Organizations Various international organizations such as the UN try to mediate to defuse conflicts. However, they often encounter difficulties due to the diverse political interests of member countries. For example, in the Syrian conflict, divisions within the Security Council made efforts for a peaceful resolution difficult. Environmental Issues and Modern War Modern war also pays attention to environmental issues. Limited natural resources can trigger new tensions and conflicts. In this case, climate change makes countries act increasingly defensively regarding resources. War over water could become a threat in the future, especially in regions that lack this resource. Technological Developments Technological advances not only define how states fight, but also influence how information is disseminated. Social media can be a tool for propaganda and mobilization, but it can also spread false information that can worsen conflict situations. Facing this challenge, it is important for the international community to be critical of the information received. Conclusion Understanding modern world war and its impact is essential to building a more peaceful future. For example, investment in education, international cooperation, and intercultural dialogue are steps that can reduce the potential for future conflict. Through this study, it is hoped that the global community will be better prepared to face challenges that may arise in international relations.