An enlarged European Union introduces new opportunities for ethnic remixing, bringing fears over potential minority return and even sovereignty in some cases. How does a border-effacing EU impact territory subject to ethnic cleansing? Why is potential minority return considered a security threat in some recently 'unmixed' areas, but not others?Ethnic Cleansing and the European Union offers the first multi-case analysis of ethnic remixing in an expanding EU. The book's two major theoretical innovations include an explanatory frame elucidating variation in Central Europe, the Balkans, and Cyprus, and an analysis of repeated minority removal for conflict resolution purposes in the early- to mid-twentieth century. Tesser argues that the Western-dominated international community's earlier endorsement of separation brought potent after-effects: incentives for ethnic cleansing and the politics of ethnic remixing in an enlarging EU. This book will appeal to all scholars interested in the European Union, Nationalism, Forced Migration Studies, and International Relations.