of Confederation and the Northwest Ordinance. The closing endorsement serves an authentication function only. It neither assigns powers to the federal government nor does it provide specific limitations on government action. It does, however, provide essential documentation of the Constitution's validity, a statement of "This is what was agreed to." It records who signed the Constitution, and when and where. Amending the Constitution The procedure for amending the Constitution is outlined in Article Five (see above). The process is overseen by the archivist of the United States. Between 1949 and 1985, it was overseen by the administrator of General Services, and before that by the secretary of state. Under Article Five, a proposal for an amendment must be adopted either by two-thirds of both houses of Congress or by a national convention that had been requested by two-thirds of the state legislatures. Once the proposal has passed by either method, Congress must decide whether the proposed amendment is to be ratified by state legislatures or by state ratifying conventions. The proposed amendment along with the method of ratification is sent to the Office of the Federal Register, which copies it in slip law format and submits it to the states. To date, the convention method of proposal has never been tried and the convention method of ratification has only been used once, for the Twenty-first Amendment. A proposed amendment becomes an operative part of the Constitution as soon as it is ratified by three-fourths of the States (currently 38 of the 50 states). There is no further step. The text requires no additional action by Congress or anyone else after ratification by the required number of states. Thus, when the Office of the Federal Register verifies that it has received the required number of authenticated ratification documents, it drafts a formal proclamation for the Archivist to certify that the amendment is valid and has become part of the nation's frame of government. This certification is published in the Federal Register and United States Statutes at Large and serves as official notice to Congress and to the nation that the ratification process has been successfully completed. Ratified amendments The Constitution has twenty-seven amendments. Structurally, the Constitution's original text and all prior amendments remain untouched. The precedent for this practice was set in 1789, when Congress considered and proposed the first several Constitutional amendments. Among these, Amendments 1–10 are collectively known as