Article V
         of the U.S. 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 ...