Traditional alliances are still valid in current world politics. However, in the new world order, it is an undeniable fact that there has been a period of “compartmentalization” in which two states can cooperate in a certain area and at the same time experience conflicts in different areas. In this framework, this period in which inter-country reconciliation and disagreements co-exist indicates that alliances are based on a compartmentalized structure. In recent years, the arguments that the US-centered world order has begun to give its place to a multipolar system have been expressed by different academics and experts. Especially China, whose economic growth is exaggerated, is positioned as a new global power against the US. However, in the current global order, it would be a very appropriate determination to link the rise of China to the relative loss of power of the US. In this respect, this study analyzes the foreign policy moves of the US during the period of compartmentalization and it is argued that the US power in the international arena was weakened in this period. In the period of compartmentalization, the US maintained its existence by pursuing a policy based on balance of power instead of being an absolute power in world politics. This situation is an indicator that the international power of the US is declining. In this regard, the National Security Strategy Report published in 2017 during the Donald Trump administration period is of great importance. In the National Security Strategy Report, it is noteworthy that the US implemented policies on the basis of the balance of power during the period of compartmentalization and continued policies over power centers in the region instead of seeing Europe as a single ally in transatlantic relations. In addition, in the aforementioned study, the argument that the US lost its absolute power in the period of compartmentalization is analyzed by examining the policies of the US against China in the Asia-Pacific region.