Modern World War refers to large-scale conflicts that permanently changed the global political, social and economic map. The two major world wars, namely World War I (1914-1918) and World War II (1939-1945), present a complex picture of ongoing impact and relevance to the world today. The Global Impact of the First and Second World Wars was far-reaching. First, these two wars caused the deaths of millions of people. Statistics show that around 40 million people died in World War I, while World War II claimed up to 85 million victims. This human loss not only has an impact on demographics, but also creates a prolonged social crisis. Second, a shift in global power occurred. After World War II, the US and Soviet Union emerged as superpowers, giving rise to the Cold War era that lasted for several decades. The influence of these two countries is felt to this day, when international politics is influenced by the ideologies of capitalism and communism. Third, the economic impact of the World Wars was also significant. After World War I, various European countries experienced a severe economic depression. In contrast, the US, which became the main supplier in the post-massacre era, experienced rapid economic growth. After World War II, the Marshall Plan aided the reconstruction of Europe, forming the basis for a more cohesive European Union. The relevance of Modern World War lies in the lessons that can be drawn from history. First, the importance of diplomacy in maintaining peace. The failure of negotiations led to major conflicts, which shows that international dialogue and cooperation are crucial. Second, the role of technology in warfare is very prominent. Innovations such as fighter planes, tanks, and nuclear weapons showed that technology could change military tactics and the impact of war. This is relevant in current discussions about the ethics of the use of drones and automatic weapons. Third, the social impact of both wars created awareness of human rights. The movement for women’s voting rights and the push for decolonization emerged as a result of the social changes sparked by the war. Today, the need to protect human rights throughout the world continues to be a priority. Therefore, understanding Modern World War is not only from a military perspective but also from its broad social, political and economic impacts. By analyzing these two wars, we can better understand today’s global challenges, as well as the importance of justice, peace, and international collaboration to create a better world.