State Succession: Treaties, Property, Debts and Membership

States are born, merge, break up and transfer territory. When one state replaces another in responsibility for a territory, questions arise about the old state's treaties, property, debts, membership of international organisations and the rights of individuals. This is the law of state succession. Much of it remains uncertain and depends on agreement, but two Vienna Conventions and recent practice give guidance. This note covers each area, with the Indian experience.

1. Meaning and Kinds

• Definition. Succession of states means the replacement of one state by another in the responsibility for the international relations of territory (Article 2(1)(b), Vienna Convention on Succession of States in respect of Treaties, 1978)
• Succession and continuity. A continuing state keeps its identity and its rights and obligations, as Russia did for the USSR; a successor state is a new person.

Figure 1: Kinds of succession

• Universal succession. Grotius treated succession like inheritance, with the successor taking all rights and obligations.
• Clean slate. The new state starts free of the predecessor's obligations; this view gained ground in decolonisation.
• Conventions. The 1978 Convention on treaties entered into force in 1996 but has few parties; the Vienna Convention on Succession of States in respect of State Property, Archives and Debts, 1983 is not in force; much of the law rests on custom and agreement.

2. Succession to Treaties

Figure 2: Main rules of the 1978 Convention

• Boundaries and territorial regimes. Succession does not affect boundaries established by treaty or territorial regimes, such as rights of navigation or demilitarisation; in Gabčíkovo-Nagymaros (1997), the ICJ held that Article 12 reflects customary law and that the 1977 treaty, creating a territorial regime on the Danube, bound Slovakia as successor.
• Newly independent states. May choose which treaties to continue; the Nyerere doctrine, announced by Tanganyika in 1961, gave a period during which old treaties would apply provisionally while the new state decided.
• Political treaties. Treaties closely tied to the predecessor, such as alliances, lapse.
• Human rights treaties. Many argue that human rights treaties continue automatically for the people of the territory; the Human Rights Committee took this view in General Comment No. 26 (1997)

3. Property, Archives and Debts

Figure 3: Succession to property and debts

4. Membership of International Organisations

• Continuing states keep membership. Russia took over the USSR's UN seat, including its permanent seat on the Security Council, in December 1991, without objection.
• New states apply afresh. The Federal Republic of Yugoslavia's claim to continue the membership of the former Yugoslavia was not accepted (General Assembly resolution 47/1, 1992); it was admitted as a new member in 2000.
• India and Pakistan, 1947. Under the Indian Independence (International Arrangements) Order, 1947, India continued the international personality of British India and its UN membership, held since 1945; Pakistan was treated as a new state and admitted to the UN in September 1947.

5. Nationality and Private Rights

• Nationality. The ILC Articles on Nationality of Natural Persons in relation to the Succession of States (1999) aim to prevent statelessness and allow persons with links to more than one state a right of option.
• Acquired rights. In German Settlers in Poland (1923) and Certain German Interests in Polish Upper Silesia (1926), the PCIJ held that private rights acquired under the former sovereign survive a change of sovereignty.
• Indian view. Indian courts held, following the act of state doctrine, that when territory is acquired, rights against the former ruler are enforceable against the new sovereign only if it recognises them, as in State of Gujarat v Vora Fiddali Badruddin Mithibarwala (1964)

6. Frequently Asked Questions

Is a new state bound by the boundary treaties of its predecessor?

Yes. Under Article 11 of the 1978 Convention, which reflects customary law, succession does not affect boundaries established by treaty, so that frontiers remain stable.

Why did India keep its UN membership in 1947 but Pakistan did not?

Because India was treated as continuing the international personality of British India, an original member of the UN, while Pakistan was treated as a new state that had separated from it and had to apply for admission.

What is the clean slate rule?

The rule that a newly independent state, emerging from a dependent territory, is not bound by its predecessor's treaties merely because of succession. Under Articles 16 and 17 of the 1978 Convention, it may choose to become a party to multilateral treaties by notifying succession, but boundary and territorial regimes still bind it.

Do private property rights survive a change of sovereignty?

In international law, yes: the PCIJ held in German Settlers in Poland (1923) that acquired private rights survive. Indian courts, applying the act of state doctrine, held that such rights bind the new sovereign only if it recognises them.

7. Related Topics

• Topic 17: Law of Treaties V. Gabčíkovo-Nagymaros.
• Topic 19: Statehood. Creation and extinction of states.
• Topic 38: Nationality. Nationality and statelessness.