This essay will attempt to discuss the above statement in the context of the nature of international law in the unipolar world. First, the basic definitions such as the definition of international law along with its sources, questions about it and the definition of unipolar world will be placed in the essay. Secondly, we will try to analyze why states, including the hegemonic power, comply with the norms of international law in the unipolar world with specific instances. Finally, a comparison will be proposed between the unipolar world and today's world in terms of the implementation of obligations arising from international law, starting from the development of international law and accepted norms do not oblige states to comply with them at all times. Louis Henkin's book, How Nations Behave, articulates the degree of conformity. He argues: “Almost all nations observe almost all principles of international law and almost all their obligations at almost all times.” INTRODUCTION In humanity's long march from the cave to the computer, a central role has always been played by the idea of ​​law. Every society, large or small, powerful or weak, has created for itself a structure of principles within which to develop. Now, as a result of modern technology, communications, transportation and more, the evolving process of globalization, “the internationalization of the world,” has provided the opportunity for international law and accepted norms to reach every corner of the globe . Traditionally, international law consisted of rules and principles that governed relationships and relationships between nations, although recently the scope of international law has been redefined to include relationships between states and i... half of the document... which it was significantly “unipolar”. Since then the United States has enjoyed a leading status and role; its economy has grown at an extraordinary rate, its military strength is unmatched, its political influence in international affairs has been unchallenged, and its ideology of democratic principle has earned its world leadership. Unipolarity was empirically refuted by the failure of the US-led “coalition of the willing” in the Iraq war. Many international law scholars and foreign governments have argued that the recent war in Iraq violated international law. However, no state and no treaty could impose sanctions on the United States. On the diplomatic front, the United States failed to gain United Nations Security Council (UNSC) approval to go to war in Iraq. The issue of preventive war has divided the United States and the United Kingdom from their European partners – France and Germany – and other global partners