The Modern World War created deep collapse and change in every aspect of human life, especially in the social and economic fields. This major conflict not only involved the military, but also affected the social structure and economic conditions throughout the world. From a social perspective, the World War accelerated changes in norms and values. Gender roles underwent a significant transformation, as women contributed to industrial and military sectors that were previously dominated by men. This resulted in a stronger post-war women’s rights movement, including better access to education and participation in politics. In many cases, families must adapt to the loss of a member or the return of a traumatized veteran. This social impact is also seen in increased social mobility. Many people are moving from villages to cities, looking for job opportunities in growing industries. This migration created a multicultural society, but also presented challenges in terms of integration and relations between ethnic groups. In the economic field, the Modern World War caused major changes in the global economic landscape. The industrial sector experienced rapid growth, with many countries investing in infrastructure and technology to support wartime needs. This created massive economic growth, but also generated inequality. Countries that are able to produce more materials and weapons often benefit more, while weaker countries face difficulties. Inflation and recession become common after war, especially when the economy has to adjust to the post-conflict period. Several countries experienced prolonged periods of depression, the result of lost infrastructure and a series of inappropriate policies. However, some countries have also experienced “economic booms” thanks to foreign aid and development investment. The Modern World War also brought changes to the international trade system. Various trade agreements and alliances were formed to strengthen the global economy, replacing the old, more protectionist system. This creates strong interdependence between countries, but also increases geopolitical tensions as countries try to defend their national interests. The social and economic changes triggered by the Modern World Wars illustrate how conflict can shape the course of history. By being aware of these impacts, we can better understand the complexity of human interactions and how society adapts to face existing challenges. Through in-depth analysis, we can draw valuable lessons to face current and future global challenges.