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.