Since the end of the 19th century, most contracts have followed a fairly consistent format. A contract usually begins with a preamble describing the “High Contracting Parties” and their common objectives in the implementation of the treaty, as well as the synthesis of all the underlying events (for example. B the consequences of a war in the case of a peace treaty). Modern preambles are sometimes structured as a very long set, formatted into several paragraphs to be readable, in which everyone begins with a sieve (wish, acknowledge, have, etc.). Bilateral agreements are concluded between two states or entities.  A bilateral contract may have more than two parts; Thus, each bilateral treaty between Switzerland and the European Union (EU) has seventeen parties: the parties are divided into two groups: the Swiss (“on the one hand”) and the EU and its member states (“on the other side”). The treaty establishes rights and obligations between Switzerland and the EU and the Member States for several years – it does not create rights and obligations between the EU and its member states. [Citation required] Treaties were an important part of European colonization and, in many parts of the world, Europeans tried to legitimize their sovereignty by signing treaties with indigenous peoples. In most cases, these contracts were in extremely unfavourable terms for Aboriginal people, who often did not understand the effects of what they signed. [Citation required] IpPC is a contract to prevent the introduction and spread of pests to plants and plant products and currently has 177 government recipients. IPPC has developed plant health guidelines and serves as a reporting centre and source of information. Seven regional plant protection organizations have been established under the aegis of ipPC. For example, the North American Plant Protection Organization (NAPPO) consists of the United States, Canada and Mexico, which participate through APHIS, the Canadian Food Inspection Agency (CFIA) and the Plant Health Directorate.
The European and Mediterranean Organization for the Protection of Plants (EPPO) is an intergovernmental organisation that is also responsible, within the framework of the IPPC, for plant health cooperation between 50 countries in the European and Mediterranean region. Despite what some see as an unsatisfactory system for drafting and implementing treaties, Canada is one of the most active states parties in the world. Much of LAW`s international treaties were included in the Vienna Convention on Treaty Law, to which Canada joined in 1970. Although the federal government is competent to enter into contracts, it can only legislate on contracts that fall under federal jurisdiction.