The Constitutional Convention of 1787 was held in Philadelphia, PA. Wilson and Rutledge kept extensive notes at the convention and devised the method of ratification.
Article V of the Constitution provides two methods to propose amendments and two methods for ratification. Constitutional amendment proposals in method one are by joint resolution of the Congress with a 2/3 vote in each house. (This is the only method that has been used.) Method two is by way of petitions to Congress by 2/3 of the states to conduct a convention for proposing amendments, and then holding such a convention. (An Article V convention has never been held). Amendments proposed by either the congressional method or the convention method are then submitted to the states for ratification. There are two possible methods here as well. Ratification can be done by way of the votes of the state legislatures or by specially elected delegates to state ratification conventions. In either case, ratification requires the votes of 3/4 of the states. The convention method was used in the case of the 21st Amendment (repeal of prohibition).
You devised a question using the word devised. Scientists devised a method of measuring ozone in the upper atmosphere.
Every Amendment to the U. S. Constitution to date has been proposed by the method of two thirds of each house of Congress approving the proposal before it goes to the states for ratification. Also, two-thirds of the states can hold conventions to propose amendments
Ratification by the three-fourths of the state legislatures
Either Congress or a constitutional convention have the power to do propose amendments to the US Constitution under Article V of the Constitution. Congress may proposes a specific amendment for ratification by votes of two thirds of both houses of Congress. Congress may also convene a constitutional convention, on application of the legislatures of two thirds of the states, in order for the convention to prepare and propose specific amendments for ratification. This method has not yet been used.
No branch, but the constitution itself does this.
Three-fourths of state legislatures must approve an amendment proposed by Congress to the United States Constitution. An alternate method of ratification is for three-fourths of states must vote in favor of the amendment during a ratifying convention. This alternate method has only been used one time, for the ratification of the Twenty-First Amendment which repealed Prohibition.
No method has yet been devised for growing trees on the moon.
The first method is for a bill to pass both houses of the legislature, by a two-thirds majority in each. Once the bill has passed both houses, it goes on to the states. This is the route taken by all current amendments. Because of some long outstanding amendments, such as the 27th, Congress will normally put a time limit (typically seven years) for the bill to be approved as an amendment (for example, see the 21st and 22nd).The second method prescribed is for a Constitutional Convention to be called by two-thirds of the legislatures of the States, and for that Convention to propose one or more amendments. These amendments are then sent to the states to be approved by three-fourths of the legislatures or conventions. This route has never been taken, and there is discussion in political science circles about just how such a convention would be convened, and what kind of changes it would bring about.Regardless of which of the two proposal routes is taken, the amendment must be ratified, or approved, by three-fourths of states. There are two ways to do this, too. The text of the amendment may specify whether the bill must be passed by the state legislatures or by a state convention.See the Ratification Convention Page for a discussion of the make up of a convention. Amendments are sent to the legislatures of the states by default. Only one amendment, the 21st, specified a convention.In any case, passage by the legislature or convention is by simple majority. The Constitution, then, spells out four paths for an amendment:Proposal by convention of states, ratification by state conventions (never used)Proposal by convention of states, ratification by state legislatures (never used)Proposal by Congress, ratification by state conventions (used once)Proposal by Congress, ratification by state legislatures (used all other times)
The first method of amendment is the only one actually used so far. An amendment is proposed in the Congress and approved by at least two thirds of each house. It must then be ratified by three fourths of the states. Either of two methods of state ratification can be chosen by Congress: approval by the state legislatures or by a special convention in each state. The second method of amending the Constitution has never been used successfully since the original Constitutional Convention. If two thirds of the state legislatures approve of a convention for proposing amendments, any amendments coming out of the convention are submitted for ratification by the states. This has been tried several times in recent decades to advance amendments requiring a balanced budged, term limits and the like.
An amendment, in order to become part of the Constitution, must be ratified by three-fourths of the states.There are two "Mode(s) of Ratification" in Article V of the US Constitution. One is ratification by the legislatures of three-fourths of all the states. The second is ratification by special Conventions (called for the purpose of ratifying the proposed amendment) of three-fourths of all the states.Amendments can be proposed for ratification in two different ways. One is where two-thirds of both Houses of Congress propose a specific amendment. The second is where two thirds of the legislatures apply to Congress to call a Convention for the purpose of proposing amendments. This second method of proposing amendments for ratification has never been used.In the first method, Congress decides on the wording of the proposed amendment. In the second, the Convention decides on the wording of the proposed amendment. The Convention may propose as many amendments as it deems appropriate.Congress decides whether states can ratify via their state legislatures or through special state conventions. The first method is used unless the second is required by the wording of the amendment.The amendment process is found in article 5 of the Constitution ( see the related link)
proposal by initiative.
The two steps in the second method of amending the Constitution are: proposal by Congress and ratification by conventions.