'The Restriction of National Sovereignty' is a scholarly contribution to the idea of European Integration and the long-term efforts to build an International World Government. Many today seem to have forgotten that the original idea for building a united Europe was to establish an international political system suited to purport peace, stability and growth for all nation states, regardless of their military might, or their economic and political power. This study first discusses the restriction of national sovereignty in the area of commercial relations between foreign states and private trading companies. Here, since the second half of the 19th century, a clear trend to restrict foreign sovereign immunity was to be seen and has profoundly changed international law. In cases that involve foreign sovereign immunity, now the Restrictive Immunity Doctrine reigns which distinguishes between commercial and governmental acts carried out by foreign governments. In all matters commercial, foreign states do not enjoy immunity from jurisdiction. The projects discussed in Chapter 4 of the study were targeting at bringing about a new era of peace through the restriction of national sovereignty. The people who drafted these projects were no lesser than the greatest philosophers of Europe, among them Abbe de Saint-Pierre, Jean-Jacques Rousseau, Immanuel Kant, Saint-Simon, and Count Coudenhove-Kalergi. The study shows that world peace is conditioned upon the restriction of national sovereignty, one of the most dangerous concepts of international law. It is an idea that goes back to the Renaissance and was drafted mainly under the pulpit of Jean Bodin and Niccolo Machiavelli. No other concept in international relations has cost the lives of so many victims of war, wherever in the world. Besides, this doctrine is an alien element in today's international network culture and at a time where the relationship ruler-vassal has become one of government-citizen. When nations understand that in a networked international community, any war means auto-destruction by implication, the need for the restriction of sovereignty through the establishment of a supranational authority or world government becomes obvious."