At the end of the twentieth century, the pace of change in the international system is increasing. New actors and even new categories of actors are emerging. Some have a strong impact on international relations, thus competing with the traditional type of international actor, the sovereign nation-state. One salient feature of the nation-state is its power to control its borders. In the process of globalization, this power is being disintegrated. In some respects, national borders have completely lost their relevance, owing to certain adverse ecological developments like the degradation of the ozone layer and other virtually global threats. They are equally of limited use in influencing the speed and content of some trade operations concerning goods or currencies or the free flow of media information. They however continue to function in a rather efficient way for people. Immigration laws and certain other procedures of the 'rich' countries tend to distinguish between wanted and unwanted immigrants. Due to various catastrophies and disasters, wide-spread violence and the anticipation of a bleak economic future, the number of migrants continues to grow rapidly, as does the pressure from migrants from the 'poor' and densely populated countries of the world on the borders of the 'rich' countries. This is a multi-dimensional development with political, economic, but also moral aspects.
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