This article analyzes and claims the constituent power of the peoples of the world on the international arena. Notice how, in a globalized world, the ability of acting of a large majority of States seems trapped in the neoliberal discourse in democracies radically co-opted by media and the influence of financial groups that diminish their capacity to deal with problems affecting all peoples. Whether dealing with the reform of the United Nation or the international financial organizations and the unstable system perpetuated by them; whether dealing with the global environmental crisis and in particular on climate change or war, terrorism and massive human rights violations, this article puts emphasis on the opportunity for the peoples to exercise their constituent power. In relation to the processes of constitutionalization of international law, a question arises from the analysis: these processes have a future without consideration of the peoples, their legitimating power, their struggles, their strengths and their contributions from different political and cultural perspectives? It is argued that individuals and peoples must be the foundation of the international political organization. The central thesis underpins the imperative, for the peoples of the world, to claim their legitimating power to promote global democracy.