In India, the themes are divided into three lists: the Union, the State and the Simultaneous. In the normal legislative process, issues on the trade union list must be regulated by law by the Indian parliament. For the subjects on the national list, only the state legislator can legislate. Both governments can legislate on subjects on the same list. However, for the implementation of international treaties, Parliament can legislate on any subject and even repeal the general distribution of lists of subjects. In other cases, such as New Zealand with the Maori and Canada with its First Nations and First Nations, treaties have allowed Aboriginal people to maintain a modicum of autonomy. Such agreements between colonizers and indigenous peoples are an important part of the political discourse of the late 20th and early 21st centuries, the treaties that are being discussed have an international reputation, as indicated by a UN treaty study.   Contracts are not necessarily permanently binding on signatories. Since obligations under international law have traditionally arisen only from the agreement of states, many treaties explicitly allow a state to withdraw as long as it follows certain notification procedures.
For example, the Single Convention provides that the treaty expires when the number of parties is less than 40 due to termination. Many contracts explicitly prohibit withdrawal. Article 56 of the Vienna Convention on Treaty Law provides that when a treaty is silent on whether it can be denounced or not, there is a rebuttable presumption that it cannot be denounced unilaterally, unless Article 46-53 of the Vienna Convention on Treaty Law defines the only possibilities for invalidating contracts that cannot be considered unenforceable and not applicable under international law. A treaty is invalidated either because of the circumstances in which a State party has acceded to the treaty, or because of the very content of the treaty. Cancellation is separate from termination, suspension or termination (addressed above), all of which involve a change in the consent of the parties to a previously valid contract, not the nullity of that consent in the first place. In the United States, the term «treaty» has a different, more limited legal meaning than in international law. U.S. legislation distinguishes what it calls «treaties» from «executive agreements» that are either «executive agreements of Congress» or «single executive agreements.» Classes are all treatises of international law in the same way; they differ only in U.S. domestic law. A treaty is a formal and binding written agreement that is concluded by actors in international law, usually sovereign states and international organizations, but may involve individuals and other actors.  A treaty can also be described as an international agreement, protocol, treaty, convention, pact or exchange of letters.