The main approaches to the regulation of the status of national minorities in the Polish state restored after the First World War were investigated. They were reflected in the relevant provisions of the first Constitution of independent Poland (March 1921), which was a kind of compromise between the views of the Polish right-wing led by Roman Dmowski, who advocated the absolute dominance of ethnic Poles' interests, and the leaders of Polish socialist parties (T. Goluwko, L. Wasilewski), who wanted to support the national and cultural inspirations of minorities in exchange for their loyalty to the Polish state.
 The legal acts used to regulate the situation of national minorities were analysed. Their compliance with the international legal mechanisms for the protection of national minority rights, which began to operate in Europe within the framework of the Versailles-Washington system of international relations, in particular, the provisions of the Treaty of Versailles Minor, was determined. In case of compliance with the proclaimed legal norms, the Polish state had every chance to avoid an open confrontation with representatives of the non-title nation. However, the situation in Poland with regard to national minorities became a classic example of the discrepancy between law-making theory and law enforcement practice.
 It has been proved that due to the lack of mechanisms for monitoring compliance with international norms which were supposed to guarantee the rights of national minorities and imperfections in domestic legislation, the Polish authorities at various levels have repeatedly violated the democratic principles of the March 1921 Constitution and other legal acts designed to ensure equal rights for representatives of national minorities, which, in turn, created constant tension within the Second Polish Republic, destabilising the internal situation in the country.
 This situation was caused by a number of factors: the difficult economic situation, which provoked permanent tensions in society and the Poles' disrespect for members of national minorities. Artificially created borders after the First World War also provoked interethnic conflicts. Finally, it should be considered that the vast majority of Poles were supporters of the concept of the nation-state promoted by the National Democrats, which envisaged the assimilation of national minorities.
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