Contracts sometimes contain self-fulfilling provisions, which means that the contract is automatically terminated if certain defined conditions are met. Some contracts should only be binding temporarily by the parties and will expire at some point. Other contracts may be terminated themselves if the contract is to be concluded only under certain conditions.  The Canadian government recognizes 70 historic treaties in Canada, signed between 1701 and 1923. These treaties include: treaties are not necessarily binding on a permanent basis for 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, after their adoption, treaties and their amendments must follow the official legal procedures of the United Nations, as applied by the Legal Bureau. , including signature, ratification and entry into force. Canada and First Nations often have differing views on the implementation of historic treaties; these problems are complex and difficult to solve. With means such as the recognition of Aboriginal rights and discussion tables on self-determination, Canada and the Treaty First Nations are looking for ways to advance the rights and interests of the Treaty. There are several reasons why an otherwise valid and agreed treaty can be rejected as a binding international convention, most of which pose problems related to contract formation.
[Citation required] For example, the Japan-Korea treaties of 1905, 1907 and 1910, which ended in series, were protested;  and they were declared „null and void” in the 1965 Treaty on Fundamental Relations between Japan and the Republic of Korea.  While the Vienna Convention provides for a general dispute resolution mechanism, many contracts establish a process outside the Convention to resolve disputes and alleged infringements.