This article is an analysis of the complex relations between concept of multiculturalism and modern liberal nation states, which are based on a principle of common citizenship. Consequently, in this article we question the impact of multiculturalism on the process of integration in these societies, which inevitably brings us to a contemplation of the complex relations of modern liberal democracy and nationalism. The author presents the most influential ideas of the political philosopher Brian Barry who, as a liberal egalitarian, criticized multiculturalism from the theoretical position of liberalism that seeks to provide social justice. The structure of this paper reflects his prominent ideas on this matter. In three separate chapters, the ...