A dominant power in the international system has to provide benefits to its allied countries. This is the Realist explanation of defining a hegemonic power which is conditional to the provision of public goods to the allied countries. Despite several challenges from different blocs, USA has been at the forefront of orchestrating the liberal world order since the end of the Cold War, if not the Second World War. That trend stopped dramatically with the arrival of Donald Trump at the White House in 2017, as his administration questioned the fundamental logic behind the country's financial and political support to its allies and multilateralism. The consequences were felt in the American commitment to the transatlantic security establishments, environmental treaties, regional initiatives and intergovernmental organizations.....