The First World War launched a tremendous restructuring of the international system. One of its major outcomes was a transformation of the small states of Central and South-Eastern Europe from objects to subjects of international relations. Having emerged or enlarged their territories in wake of multinational empires’ collapse, the small states became key players on the regional level. Reshaping of the Balkan regional order is of a particular interest to researchers as the Balkan instability triggered destruction of the previous international system. The purpose of the article is to understand how a world conflict, which had broken out in South-Eastern Europe, transformed the region. To do this the author dwells upon three sets of question. The first is the Balkan contribution in the origins of the First World War. The second is an interplay of factors which caused reshaping of the Balkan political space during the war years. The third is a new landscape of the postwar order in South-Eastern Europe. Methodological approaches applied here define new and actual character of this article. The author uses conceptual tools of the theory of international relations to analyze a process of region «building» which took place in circumstances of «tectonic» shifts within the international system in the early decades of the 20th century. Thus, the author applies the analytical model of the regional order as well as key definitions of the theory of international relations – great power, small state (the article focuses on Serbia, Romania, Bulgaria and Greece), principle of self-determination. It is concluded that the regional order emerged in the Balkans in wake of the First World War was a result of multi-dimensional interaction of factors. They are as follows: 1) the military, strategic and foreign policy planning of hostile coalitions of powers (the Entente and the bloc of the Central powers), seeking to win the loyalty of regional allies; 2) demonstrated by the small states understanding that the war had opened a «window of opportunity» to put into life their national interests and programs; 3) the decline of traditional multi-ethnic empires, which had formed political atmosphere in the Balkans. It is stated that a landscape of post-war regional order in the Balkans was determined with cooperation and competition of the local national states in the situation when the multi-ethnic empires had disappeared from the Balkan political space while the architects of the Versailles system – Great Britain and France seemed to be less interested in South-Eastern Europe in after war years. It meant that the new Balkan order enjoyed a relative autonomy compared to the previous one.
The Constitutional Mosaic Across the Boundaries of the European Union:: Citizenship Regimes in the New States of South Eastern Europe