The world leadership of the United States has recently undergone a significant evolution. At the end of the Cold War the USA was the only superpower, exerting immense influence on the resolution of global and regional problems. In the 1990s America continued to maintain its dominant role in the world. The dynamism of events at the onset of the 21st century, mistakes in American policy and a changing international environment markedly weakened the USA’s capacity and readiness to tackle challenges and solve problems. America expected support and greater involvement on the part of its allies/partners in fulfilling its obligations on the international arena. Thus, the future of the American leadership remains an open question.