Each authority of the U.S. government that enters into an international agreement is responsible for forwarding the text of the agreement to the Office of Contract Affairs no later than 20 days after its conclusion. 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.  Initially, international law did not accept and reject reservations unless all parties accepted the same reservations. However, in order to encourage as many states as possible to join the treaties, a more straightforward reserve rule has been established. While some treaties still explicitly prohibit any reservations, they are now generally accepted to the extent that they are not incompatible with the objectives and objectives of the treaty. The Case-Zablocki Act (1.U.S.C 112b) – as implemented by 22 CFR Part 181 – requires coordination with the Secretary of State before international agreements are concluded and a timely report to Congress on international agreements concluded after entry into force. These requirements apply to all U.S. government authorities, whether such international agreements are concluded on behalf of the U.S.
government or on behalf of a U.S. government agency. 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.). An essential part of treaty drafting is that the signing of a treaty implies recognition, that the other party is a sovereign state and that the agreement, considered to be under international law, is applicable. Therefore, nations can be very cautious when it comes to qualifying a treaty agreement. In the United States, for example, interstate agreements are pacts and agreements between states and the federal government or between government authorities are statements of intent.
The U.S. Supreme Court has held in the basic currency cases that « contracts » do not have a privileged position in relation to the laws of Congress and may be nullified or amended by any subsequent acts of Congress under U.S. law, just like any other ordinary law. The court also tried in Reid v. In a covert way, that the provisions of the treaty that are in conflict with the U.S. Constitution are null and void under U.S. law.  The distinctions are primarily related to their method of authorization.