The text focuses on the ways in which Polish national representation in the Czech Republic has taken advantage of the European integration process in order to assert or fulfill their own expectations in relation to the national politics of the Czech Republic and Poland. On examples of promoting language policy and the Euroregion Teschen Silesia the paper describes an advocacy of a cultural politics that seems to overlap and restrict the sphere of activity of a nation-state. In both cases plays an important role concept of culture. Culture is used as an argument during recollections of the past, delimitations of the region of Teschen Silesia by the state border, and in debates on its essence; it works as a tool that differentiates people, comprises a field of confrontation for contesting social groups. Thus culture is much more a matter of power than of analysis.