The Vienna Convention on the Law of Treaties is the United Nations agreement which codifies the rules governing contractual relations between States. The Convention provides an international framework for these peacetime relations (the effects of the outbreak of hostilities between States on treaties are explicitly excluded from the scope of the Convention). That framework shall include the rules on the conclusion and entry into force of contracts, their compliance, application, interpretation, amendment and amendment, as well as the rules on invalidity, termination and suspension of the application of contracts. In creating this legal framework, the Convention promotes the objectives of the United Nations as set out in its Charter, including the maintenance of international peace and security, the development of friendly relations among States and the implementation of cooperation among the United Nations. Beginning in 1976, the Nisga`a government and Trudeau entered into contract negotiations. Fourteen years later, in 1990, the two sides reached a provisional agreement and also welcomed the Province of British Columbia in the negotiations. In 1996, the three sides agreed on the agreement, but it was not until 2000 that the Nisga`a achieved autonomy. The agreement also allowed the Nisga`a to control about 2,000 km2 of their ancestral territory. The Treaty of Nisga`a was the first modern treaty in British Columbia and served as a model for many future First Nations who aspired to modern self-management and contractual arrangements in Canada. The Federal Constitution of Brazil stipulates that the power to enter into contracts is vested in the President of Brazil and that these treaties must be approved by the Brazilian Congress (Articles 84, Clauses VIII and 49, Clause I). In practice, this has been interpreted as being free for the executive to negotiate and sign a treaty, but that its ratification by the president requires the prior approval of Congress. In addition, the Federal Supreme Court decided that after the ratification and entry into force of a presidential decree published in the Federal Register, a treaty must be incorporated into national legislation in order for it to be valid in Brazil and applicable by the Brazilian authorities.
The language of treaties should be interpreted, like that of a law or contract, if the wording was not clear or if it was not immediately clear how it was to be applied in a perhaps unforeseen circumstance. The Vienna Convention provides that contracts must be interpreted « in good faith » on the basis of « the usual importance given to contractual conditions in their context and in the light of their purpose and purpose ». International legal experts also often invoke the « principle of maximum efficiency », which interprets the contractual language in such a way that it has the maximum force and effect to establish obligations between the parties. Although Jay`s contract is not an Indigenous treaty from a technical point of view, its terms have had a significant impact. The U.S. government respected the agreement to the extent that Status Indians of Canada could live and work fully in the United States. However, the treaty is not recognized as binding by Canada – a position that is regularly questioned, particularly by Indigenous nations like six nations, whose country is divided by the border. .