Article V 

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.