
The process of amending the US Constitution is a complex and lengthy procedure, and it has only been amended 27 times. Amendments can be proposed by Congress with a two-thirds majority in both the House of Representatives and the Senate, or by a convention requested by two-thirds of state legislatures. To become part of the Constitution, an amendment must be ratified by three-quarters of the states or ratifying conventions in three-quarters of the states. This process is known as ratification and is administered by the Archivist of the United States, who heads the National Archives and Records Administration (NARA). The Archivist's role is to certify that the amendment has been validly ratified and has become part of the Constitution. This certification is published in the Federal Register as official notice to Congress and the nation.
| Characteristics | Values |
|---|---|
| Authority to amend the Constitution | Article V of the Constitution |
| Who proposes an amendment? | Congress or a convention called by Congress at the request of two-thirds of state legislatures |
| What is the Congress vote requirement? | Two-thirds majority in both the House of Representatives and the Senate |
| What is the convention vote requirement? | Three-quarters of states or ratifying conventions in three-quarters of the states |
| Number of amendments submitted to states for ratification | 33 |
| Number of amendments ratified by state convention method | 1 (Twenty-first Amendment) |
| Number of times the U.S. Constitution has been amended | 27 |
| Number of times state constitutions have been amended | Around 7,000 |
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What You'll Learn

Two-thirds majority in Congress
The process of amending the U.S. Constitution is outlined in Article V of the Constitution. It is a difficult and lengthy process, and the Constitution has only been amended 27 times.
Amendments can be proposed by Congress with a two-thirds majority vote in both the House of Representatives and the Senate. This means that two-thirds of the members present need to vote in favour, assuming a quorum is met. This two-thirds majority is a supermajority, a higher threshold than a simple majority, and is required in 16 states for legislative approval of amendments.
Once an amendment is proposed by Congress, it is forwarded to the National Archives and Records Administration (NARA) for processing and publication. The OFR, part of NARA, adds legislative history notes and publishes the amendment in slip law format, as well as sending an information package to the States.
The Archivist of the United States, who heads NARA, is responsible for administering the ratification process. They have delegated many duties to the Director of the Federal Register, who follows procedures established by the Secretary of State and the Administrator of General Services.
The amendment then needs to be ratified by three-quarters of the states (38 out of 50) to become part of the Constitution. This can be done through the state legislatures or ratifying conventions in three-quarters of the states.
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Three-fourths of states ratify
The process of amending the Constitution of the United States is outlined in Article V of the Constitution. The process begins with a proposal for an amendment, which can be made by Congress with a two-thirds majority vote in both the House of Representatives and the Senate. Alternatively, a convention to propose amendments can be called for by Congress at the request of two-thirds of the state legislatures.
Once an amendment has been proposed, it must be ratified to become part of the Constitution. There are two methods of ratification:
- Ratification by the legislatures of three-quarters of the states (38 out of 50 states).
- Ratification by ratifying conventions in three-quarters of the states.
The first method, ratification by state legislatures, is the most common, having been used for 32 out of the 33 amendments submitted to the states for ratification. The second method, ratification by ratifying conventions, has only been used once in US history, for the 1933 ratification of the Twenty-First Amendment.
The choice of ratification method is determined by Congress, and both methods carry equal validity. The vote of each state, regardless of its population or length of time in the Union, carries equal weight in the ratification process.
The role of the Archivist of the United States and the Office of the Federal Register (OFR) is crucial in the amendment process. The OFR prepares informational material about the proposed amendment and submits it to the states for their consideration. Once the required number of authenticated ratification documents is received by the OFR, a formal proclamation is drafted for the Archivist to certify that the amendment is valid and has become part of the Constitution. This certification is published in the Federal Register and serves as official notice that the amendment process is complete.
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State convention method
The state convention method for amending the U.S. Constitution, outlined in Article V, involves a two-step process: proposing an amendment and subsequent ratification. While the President does not have a constitutional role in the amendment process, Congress plays a crucial role in both steps.
Firstly, for an amendment to be proposed, either Congress must pass the amendment with a two-thirds majority vote in both the House of Representatives and the Senate, or two-thirds of state legislatures must request a constitutional convention to propose amendments. This convention method has been used sparingly, with only one amendment, the Twenty-first Amendment in 1933, being proposed through this route.
Once an amendment is proposed, it must be ratified to become part of the Constitution. Congress decides the mode of ratification, and it can choose between state legislatures or ratifying conventions. For successful ratification, three-quarters of the states, or 38 out of 50 states, must ratify the amendment. This requirement holds regardless of the ratification method chosen.
The state convention method for ratification, also referred to as the convention method, has been used even more rarely than the proposal method. Out of 33 amendments submitted to the states for ratification, only the Twenty-first Amendment was ratified through state conventions. This process grants each state an equal vote, regardless of its population or time in the Union.
While the state convention method for amending the Constitution has been underutilized, it remains a valid option for proposing and ratifying constitutional amendments. The authority of Congress to decide the mode of ratification for each amendment contributes to the flexibility of the amendment process.
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The President's role
The President plays a significant role in the process of amending the Constitution, although the power to propose and enact amendments rests primarily with Congress. The President can influence the process through their political leadership, legislative agenda, and constitutional responsibilities.
One of the President's most important roles is setting the political agenda and driving legislative priorities. If a presidential administration prioritizes constitutional reform, it can work with Congress to propose and advocate for specific amendments. The President can use their bully pulpit to raise awareness, generate public support, and exert political pressure on lawmakers to initiate the amendment process. By shaping the national dialogue and building consensus around particular issues, a president can create a favourable environment for constitutional change.
Additionally, the President has a formal role in the enactment of constitutional amendments. Once an amendment passes Congress, it is typically sent to the states for ratification. The President, as the head of the executive branch, can facilitate this process by issuing a proclamation announcing the proposed amendment and coordinating with state officials to ensure a smooth ratification process. While the President's role at this stage is primarily procedural, it helps maintain the momentum and legitimacy of the amendment campaign.
In certain circumstances, the President's role can be more direct and personal. If an amendment specifically concerns the powers or structure of the presidency, the incumbent may have a vested interest in shaping its content. They could provide insights and recommendations to Congress during the drafting phase, ensuring the amendment aligns with their interpretation of the presidential role.
Moreover, as the head of state and chief diplomat, the President can offer valuable input on amendments pertaining to foreign affairs and international treaties. Amendments impacting foreign policy, war powers, or international agreements could benefit from the President's expertise. Their participation ensures that constitutional changes in these areas align with the nation's diplomatic interests and international obligations.
While the President does not have a direct vote in amending the Constitution, their influence is still substantial. Through political leadership, legislative advocacy, and constitutional duties, they can shape the trajectory of constitutional reform efforts. The President's involvement helps ensure that any modifications to the nation's founding document reflect contemporary priorities and needs.
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State constitutions vs. federal
The process of amending the US Constitution is a complex and lengthy procedure that has only been accomplished 27 times in the nation's history. In contrast, state constitutions are amended regularly and offer multiple paths for amendments, making them significantly easier to change. The constitutions of the 50 states have been amended approximately 7,000 times, with some states, such as Alabama, Louisiana, South Carolina, Texas, and California, amending their constitutions more than three to four times per year on average.
The authority to amend the US Constitution derives from Article V of the Constitution. The process begins with Congress proposing an amendment in the form of a joint resolution. This proposal requires a two-thirds majority vote in both the House of Representatives and the Senate or a constitutional convention called for by two-thirds of the state legislatures. The amendment is then submitted to the states for their consideration. For an amendment to become part of the Constitution, it must be ratified by at least three-fourths of the states (38 out of 50 states).
On the other hand, state constitutions can be amended through various methods, including legislatively referred constitutional amendments, initiated constitutional amendments, and constitutional conventions. In 49 out of 50 states, voter approval is required for ratifying state constitutional amendments. This means that state constitutions are directly shaped by the will of the people, making them more responsive to the needs and preferences of the citizens of that particular state.
The process for proposing and ratifying state constitutional amendments varies from state to state. While some states require a simple majority vote for approving amendments, others have unique mechanisms. For instance, Florida has constitutional commissions, such as the Taxation and Budget Reform Commission and the Constitution Revision Commission, that have the authority to propose amendments, and these commissions convene once every 20 years. Additionally, in a few states, it is possible to bypass the legislature and call for a constitutional convention through an initiative process.
In summary, amending the US Constitution is a challenging and infrequent occurrence due to the high thresholds required for proposing and ratifying amendments. In contrast, state constitutions are designed to be more flexible and adaptable, allowing for frequent amendments through multiple paths. This flexibility enables states to address local issues and reflect the values and priorities of their citizens more effectively.
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Frequently asked questions
A two-thirds majority vote is required in both the House of Representatives and the Senate to propose an amendment. Once proposed, three-quarters of states (38 out of 50) must ratify the amendment for it to become part of the Constitution.
The US Constitution has been amended 27 times.
State constitutions are amended more frequently than the federal Constitution. The constitutions of the 50 states have been amended around 7,000 times. The process varies, but generally, a majority or supermajority legislative vote is required to call a convention referendum. A referendum is then submitted to and approved by a majority of voters. Some states require a supermajority legislative vote, while others allow approval by a majority vote in a single session.
Amendments may be proposed by Congress with a two-thirds majority vote in both the House of Representatives and the Senate, or by a convention called for by two-thirds of state legislatures. The Archivist of the United States then administers the ratification process, which can be conducted by the legislatures of three-quarters of the states or ratifying conventions in three-quarters of the states.

























