TEXT OF CONSTITUTION
The Congress, whenever two thirds of both Houses shall deem it necessary, shall propose Amendments to this Constitution, or, on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as part of this Constitution, when ratified by the Legislatures of three fourths of the several States, or by Conventions in three fourths thereof, as the one or the other Mode of Ratification may be proposed by the Congress; Provided that no Amendment which may be made prior to the Year One thousand eight hundred and eight shall in any Manner affect the first and fourth Clauses in the Ninth Section of the first Article; and that no State, without its Consent, shall be deprived of its equal Suffrage in the Senate.
The Constitution may be amended in two ways. The standard device, used for all amendments so far, is for both houses of Congress to pass by two-thirds vote a proposal, which they send to the states for ratification, either by state legislatures or by conventions within the states. An amendment is ratified when three-fourths of the states approve. The Constitution also authorizes a national convention, when two-thirds of the states petition Congress for such a convention, to propose amendments, which would also have to be ratified by three-quarters of the states.