The increase in nationalist tendencies around the world after 2001 signifies changes in the concept of citizenship as reflected in the discourses of the parties coming to power. How does this translate into changes in education? In this article, I analyse the case of Poland. The research is focused on finding an answer to the following question: How does the postulate present in the programme discourse of the ruling, conservative party, of strengthening the national identity, translate into the changes in the school core curricula (CCs)? The applied method of analysis is Critical Discourse Analysis (CDA). The approach by Ruth Wodak and Martin Reisigl was adopted. The application of discursive strategies in learning outcomes relating to national identity, social equality, and diversity in the old and in the new CCs, was investigated. The analyses demonstrated a significant discursive strengthening of the national identity on the one hand, and application of mitigation/exclusion strategies in relation to issues of social equality and diversity on the other. The analyses presented in this paper contribute to the discussion on the relationship between curriculum studies and educational politics by showing the influence of the dominant ideology of contemporary politics on the concept of citizenship in the national CCs.