Thirty-three amendments to the United States Constitution have been approved by the Congress and sent to the states for ratification. Twenty-seven of these amendments have been ratified and are now part of the Constitution. The first ten amendments were adopted and ratified simultaneously and are known collectively as the
Bill of Rights. Six amendments adopted by Congress and sent to the states have not been ratified by the required number of states and are not part of the Constitution. Four of these amendments are still technically open and pending, one is closed and has failed by its own terms, and one is closed and has failed by the terms of the resolution proposing it. All totaled, more than 10,000 measures to amend the Constitution have been proposed in Congress.
Proposing amendments Article V provides two methods for amending the nation's frame of government. The first method authorizes Congress, "whenever
two-thirds of both houses shall deem it necessary," to propose constitutional amendments. The second method requires Congress, "on the application of the legislatures of two-thirds of the several states" (34 ), to "call a convention for proposing amendments". This duality in Article V is the result of compromises made during the
1787 Constitutional Convention between two groups, one maintaining that the national legislature should have no role in the constitutional amendment process and another contending that proposals to amend the constitution should originate in the national legislature and their ratification should be decided by state legislatures or state conventions. Regarding the consensus amendment process crafted during the convention,
James Madison (writing in The
Federalist No. 43) declared: Each time the Article V process has been initiated since 1789, the first method for crafting and proposing amendments has been used. All 33 amendments submitted to the states for ratification originated in Congress. The second method, the convention option, a political tool that
Alexander Hamilton (writing in the
Federalist No. 85) argued would enable state legislatures to "erect barriers against the encroachments of the national authority," has yet to be invoked. When the
1st Congress considered
a series of constitutional amendments, it was suggested that the two houses first adopt a resolution indicating that they deemed amendments necessary. This procedure was not used. Instead, both the House and the Senate proceeded directly to consideration of a
joint resolution, thereby implying that both bodies deemed amendments to be necessary. Also, when initially proposed by
James Madison, the amendments were designed to be interwoven into the relevant sections of the original document. Once approved by Congress, the joint resolution proposing a constitutional amendment does not require
presidential approval before it goes out to the states. While Article I
Section 7 provides that all
federal legislation must, before becoming Law, be presented to the president for his or her
signature or
veto, Article V provides no such requirement for constitutional amendments approved by Congress or by a federal convention. Thus, the president has no official function in the process. In
Hollingsworth v. Virginia (1798), the
Supreme Court affirmed that it is not necessary to place constitutional amendments before the president for approval or veto.
Ratification of amendments certificate of ratification of the
Nineteenth Amendment. With this ratification, the amendment became valid as a part of the Constitution. After being officially proposed, either by Congress or a national convention of the states, a constitutional amendment must then be ratified by three-fourths (38 out of 50) of the states. Congress is authorized to choose whether a proposed amendment is sent to the state legislatures or to
state ratifying conventions for ratification. Amendments ratified by the states under either procedure are indistinguishable and have equal validity as part of the Constitution. Of the 33 amendments submitted to the states for ratification, the state convention method has been used for only one, the
Twenty-first Amendment. The Court had earlier, in
Hawke v. Smith (1920), upheld the
Ohio General Assembly's ratification of the
Eighteenth Amendment—which Congress had sent to the state legislatures for ratification—after Ohio voters successfully vetoed that approval through a
popular referendum, ruling that a provision in the
Ohio Constitution reserving to the state's voters the right to challenge and overturn its legislature's ratification of federal constitutional amendments was unconstitutional. An amendment becomes an operative part of the Constitution when it is ratified by the necessary number of states, rather than on the later date when its ratification is certified. No further action by Congress or anyone is required. On three occasions, Congress has, after being informed that an amendment has reached the ratification threshold, adopted a resolution declaring the process successfully completed. Such actions, while perhaps important for political reasons, are, constitutionally speaking, unnecessary. The
archivist of the United States is charged with responsibility for administering the ratification process under the provisions of
1 U.S. Code . The archivist officially notifies the states, by a
registered letter to each state's
Governor, that an amendment has been proposed. Each Governor then formally submits the amendment to their state's legislature (or ratifying convention). When a state ratifies a proposed amendment, it sends the archivist an original or certified copy of the state's action. Upon receiving the necessary number of state ratifications, it is the duty of the archivist to issue a certificate
proclaiming a particular amendment duly ratified and part of the Constitution. The amendment and its certificate of ratification are then published in the
Federal Register and
United States Statutes at Large. This serves as official notice to Congress and to the nation that the ratification process has been successfully completed. ==Ratification deadline and extension==