The separation between the two is often unclear and is often politicized in disagreements within a government over a treaty, because a treaty cannot be implemented without a proper change in national legislation. When a treaty requires laws of application, a state may be late in its obligations if its legislator does not pass the necessary national laws. In international law and international relations, a protocol is usually an international treaty or agreement that complements an earlier treaty or international agreement. A protocol may modify the previous contract or add additional provisions. The parties to the previous agreement are not required to adopt the protocol. This sometimes becomes more evident by calling it an „optional protocol,“ especially if many parties to the first agreement do not support the protocol. 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.  After the preamble, there are numbered articles that contain the content of the parties` actual agreement. Each article title usually includes one paragraph.
A long contract can group other articles under chapter titles. 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. Regardless of terminology, only instruments that are binding on the parties are considered treaties of international law.  A treaty is binding under international law. Many states are involved in the process of drafting a treaty that often has sharp differences of opinion on the scope and content of the agreement. In order to increase the number of signatories and ratifications of a treaty, and thus the world order, international law allows states to limit the full application of a treaty or to clarify their specific understanding of the legal content. This involves reservations, declarations and derogations. A multilateral agreement is reached between several countries, which establishes rights and obligations between each party and each other party.
 Multilateral treaties may be regional or involve states from around the world.  „Mutual guarantee“ treaties are international pacts, for example. B the Treaty of Locarno, which guarantees each signatory the attack of another.  The Constitution does not have a supremacy clause with the same effects as those of the U.S. Constitution, which interests the debate on the relationship between treaties and the laws of Brazilian states. Before 1871, the U.S. government regularly entered into contracts with Indians, but the Indians Appropriation Act of March 3, 1871 (ch.