21 Lastly, it should be remembered that after the Second World War, and in reaction to its horrors, there arose a more lively sense of human rights, which found recognition in a number of International Documents and, one might say, in the drawing up of a new "right of nations", to which the Holy See has constantly contributed. The focal point of this evolution has been the United Nations Organization. Not only has there been a development in awareness of the rights of individuals, but also in awareness of the rights of nations, as well as a clearer realization of the need to act in order to remedy the grave imbalances that exist between the various geographical areas of the world. In a certain sense, these imbalances have shifted the centre of the social question from the national to the international level. While noting this process with satisfaction, nevertheless one cannot ignore the fact that the overall balance of the various policies of aid for development has not always been positive. The United Nations, moreover, has not yet succeeded in establishing, as alternatives to war, effective means for the resolution of international conflicts. This seems to be the most urgent problem which the international community has yet to resolve.
Source: Centesimus Annus (Vatican.va)