The book offers new insights into how ethnicity, language and regional-local identity interact within the context of Ukrainian political reform, and indicates how these reforms affect social cohesion among ethno-cultural groups. While the individual chapters each focus on one or a few facets of the overall research question, together they draw a nuanced picture of the multifaceted challenges to creating and consolidating social cohesion in a nationalizing state. The concept integrates various disciplines, including political science, international relations, law, and sociology. Correspondingly, the contributions are based on various methodological approaches, ranging from legal analysis over media discourse analysis, individual and focus group interviews to analysis of data from a representative population survey. The findings of the in-depth study are discussed within the broader context of comparative research on diversity management and social cohesion in fragmented societies.