Taking national unity to be desirable but not at any cost, the authors explore the conditionality of unity on genuine and lasting realization of the people's right to self-determination through the political stability, economic development, and social justice for all citizens of a country, both individually and collectively. While emphasizing that secession and separate statehood are not the only way for realizing a people's right to self-determination, the authors argue that this option must be considered seriously when a people is denied their right to self-determination within the country. If this right is satisfied within an existing state, it is extremely unlikely that a minority would opt for the high political, economic, and security risks of separate statehood. But without that option, a majority may have little incentive to address the grievances of the minority. Applying their analysis to the civil war in Sudan, the authors propose a clear set of criteria and mechanisms for evaluating standards of achievement for self-determination with unity within a specific time. Should the conditions of unity fail to materialize, the possibility of peaceful and orderly secession must be considered.