Recent progress in science and technology has had a profound influence on man's way of life. This progress is a spur to men all over the world to extend their collaboration and association with one another in these days when material resources, travel from one country to another, and technical information have so vastly increased. This has led to a phenomenal growth in relationships between individuals, families and intermediate associations belonging to the various nations, and between the public authorities of the various political communities. There is also a growing economic interdependence between States. National economies are gradually becoming so interdependent that a kind of world economy is being born from the simultaneous integration of the economies of individual States. And finally, each country's social progress, order, security and peace are necessarily linked with the social progress, order, security and peace of every other country.
From this it is clear that no State can fittingly pursue its own interests in isolation from the rest, nor, under such circumstances, can it develop itself as it should. The prosperity and progress of any State is in part consequence, and in part cause, of the prosperity and progress of all other States. Inadequacy of Modern States to Ensure Universal Common Good the
No era will ever succeed in destroying the unity of the human family, for it consists of men who are all equal by virtue of their natural dignity. Hence there will always be an imperative need—born of man's very nature—to promote in sufficient measure the universal common good; the good, that is, of the whole human family.
In the past rulers of States seem to have been able to make sufficient provision for the universal common good through the normal diplomatic channels, or by top-level meetings and discussions, treaties and agreements; by using, that is, the ways and means suggested by the natural law, the law of nations, or international law.
In our own day, however, mutual relationships between States have undergone a far reaching change. On the one hand, the universal common good gives rise to problems of the utmost gravity, complexity and urgency—especially as regards the preservation of the security and peace of the whole world. On the other hand, the rulers of individual nations, being all on an equal footing, largely fail in their efforts to achieve this, however much they multiply their meetings and their endeavors to discover more fitting instruments of justice. And this is no reflection on their sincerity and enterprise. It is merely that their authority is not sufficiently influential.