From the Congress of Vienna, in which only 8 "Christian" states assisted, through the Hague Peace conferences and the Versailles treaty, mobilizing no more than two dozens countries, to the present UNO system, virtually universal, international society has undergone a deep democratization in the last two centuries, even if the sources of power and its distribution among countries have been substantially preserved. This process of enlargement of the old "feudatory democracy" is mostly evident in the institutional rule making for the international economic relations, where multilateral organizations for technical cooperation have a significat role in reinforcing the interdependence among states. This historical essay follows the evolution of multilateralism, in the longue durée, with particular attention to its economic features, and examines Brazil's international insertion in the world economy, as one of the few "peripheric" countries which took na active part in the making of "international economic order". Indeed, Brazil was present at the creation of most, if not all, intergovernmental organizations and took part in various multilateral conferences from XIX century to our present times.
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