
The US Constitution has been informally amended in several ways since its final ratification in 1788, without undergoing the formal amendment process outlined in Article V. The Supreme Court plays a significant role in this process by interpreting the Constitution and changing its meaning through important decisions. This is known as judicial interpretation, where the Court clarifies the provisions of the Constitution in relation to modern issues. For example, in Roe v. Wade (1973), the Supreme Court interpreted the right to privacy under the Constitution to include a woman's right to choose to have an abortion. Additionally, customs and traditions that emerge over time, such as the establishment of the President's Cabinet, can also lead to informal amendments even if they are not explicitly mentioned in the Constitution. Congress can also informally amend the Constitution through legislative action by passing laws that impact the understanding and application of its provisions.
| Characteristics | Values |
|---|---|
| Judicial interpretation | The Supreme Court interprets the Constitution and can change its meaning through important decisions. |
| Customs and traditions | Over time, certain practices can become accepted as part of the constitutional order, even if they are not explicitly mentioned in the Constitution. |
| Legislative action | Congress can pass laws that impact how certain constitutional provisions are understood and applied. |
| Political parties | Political parties have influenced the political process through the selection of candidates, the establishment of national and local party platforms, and the organisation of Congress based on party representation and majority power. |
| Societal change | Changes in society can lead to shifts in how constitutional rights are applied, such as the expansion of voting rights to include poor whites, black males, and women. |
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What You'll Learn

Judicial interpretation
The Supreme Court can informally amend the Constitution through judicial interpretation. This occurs when the Supreme Court interprets the meaning of the Constitution and its provisions in relation to modern issues. The Court's rulings can clarify what certain provisions mean in contemporary contexts, effectively changing the application of the Constitution without amending the text itself.
The Supreme Court has the power to interpret the Constitution and, through its decisions, can change its meaning. This was established in the landmark case of Marbury v. Madison in 1803, where the Supreme Court declared that federal courts could nullify acts of Congress found to be inconsistent with the Constitution. This set a precedent for judicial review, with federal and state courts at all levels able to review and declare the constitutionality of legislation within their jurisdiction.
An example of judicial interpretation is the Supreme Court's decision in Roe v. Wade (1973), which interpreted the right to privacy under the Constitution to include a woman's right to choose to have an abortion. Similarly, in Brown v. Board of Education (1954), the Court interpreted the Equal Protection Clause to strike down racial segregation in public schools, changing the application of the Constitution without altering the text.
Through judicial interpretation, the Supreme Court can adapt the Constitution to changing societal values and circumstances. This flexibility allows for the evolution of constitutional rights over time, ensuring that the document remains relevant and responsive to modern issues and interpretations.
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Landmark rulings
The US Constitution can be informally amended through judicial interpretation by the Supreme Court. The Supreme Court interprets the meaning of the Constitution and its provisions in relation to modern issues. Through its rulings, the Court can clarify what certain provisions mean in contemporary contexts, thereby changing the application of the Constitution without amending the text itself.
One of the earliest landmark cases of judicial interpretation is Marbury v. Madison in 1803. In this case, the Supreme Court established the principle that federal courts could declare an act of Congress null and void if they found it to be inconsistent with the Constitution. This case is often cited as an example of the Court's power of judicial review and its ability to interpret the Constitution.
Another notable case is Brown v. Board of Education in 1954. In this case, the Supreme Court interpreted the Equal Protection Clause to strike down racial segregation in public schools. This interpretation effectively changed the application of the Constitution without altering its text, demonstrating the Court's ability to adapt the Constitution to changing societal values.
Roe v. Wade in 1973 is another significant example of judicial interpretation. The Supreme Court interpreted the right to privacy under the Constitution to encompass a woman's right to choose to have an abortion. This ruling expanded the understanding of constitutional rights and showcased the Court's role in evolving societal interpretations of the Constitution.
Through these landmark rulings, the Supreme Court has demonstrated its ability to informally amend the Constitution by interpreting its provisions in light of contemporary issues. These cases have had a profound impact on the application and interpretation of constitutional rights, shaping the legal landscape of the United States.
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Customs and traditions
One notable example is the establishment of the President's Cabinet, which is not mentioned in the Constitution. The Cabinet is an executive advisory board that has become a recognised tradition, influencing how executive power is exercised. On all eight occasions when a president has died in office, the vice president has assumed the presidency, as established by custom. While this practice was not initially outlined in the Constitution, it has since been formalised through the 25th Amendment.
Political parties are another significant source of informal amendment. They hold national conventions to nominate the president, make official appointments, and establish national and local party platforms. These conventions and traditions are not mentioned in the Constitution but have become customary practices that influence the political process.
Additionally, each branch of the US government has developed traditions and practices that fall outside the provisions of the Constitution. For instance, prior to Franklin Roosevelt, there was an unwritten tradition that a president would not serve a third term. While this custom was eventually added to the Constitution through a formal amendment, it initially existed only as a tradition.
The Supreme Court, in interpreting the Constitution, also considers these customs and traditions. Through its rulings, the Court can effectively change the application of the Constitution without amending its text. This process, known as judicial interpretation, allows the Supreme Court to adapt the Constitution to modern issues and changing societal values.
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Legislative action
The Constitution can be informally amended through legislative action. Congress can pass laws that impact how certain constitutional provisions are understood and applied. For example, Congress has the power to pass laws under 27 specific powers granted by Article I, Section 8 of the Constitution. Additionally, Congress exercises its "implied powers" granted by Article I, Section 8, Clause 18, to pass laws deemed "necessary and proper" for the welfare of the people.
An example of legislative action that informally amended the Constitution is the Civil Rights Act of 1964, which expanded the protections against discrimination established by the Constitution. Congress can also pass declarations of war resolution, demonstrating support for the president's actions and deployed troops. Furthermore, Congress established the entire lower federal court system, including the structure and jurisdiction of the Supreme Court, through the Judiciary Act of 1789.
While the Constitution outlines specific procedures for proposing and ratifying amendments in Article V, it does not explicitly address all possible methods of amendment. Alternative approaches, such as legislative action, have been utilised to modify the Constitution without following the traditional amendment process. These legislative actions by Congress can have a significant impact on the interpretation and application of constitutional provisions, effectively resulting in informal amendments.
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Political parties
The US Constitution does not mention political parties, yet they have been a significant source of informal amendments to the Constitution over the years. Political parties have influenced the political process through the selection of candidates, the establishment of national and local party platforms, and by holding national conventions to nominate the president. They have also modified the electoral college system by creating state-specific rules for selecting electors and dictating how they vote.
The entire primary and convention process of nomination has been created and amended by the leaders of the major political parties. For example, while the Constitution and federal law do not provide a method for nominating presidential candidates, this process has been developed and amended by political parties. Similarly, the legislative process in Congress is organised based on party representation and majority power, despite this not being outlined in the Constitution.
Additionally, political parties have contributed to the development of unwritten customs and traditions within the government system. For example, the tradition of the vice president taking over if the president dies, and the tradition of a president not serving a third term, are not formally outlined in the Constitution.
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Frequently asked questions
Over time, certain practices and customs emerge that are not explicitly stated in the Constitution but become widely accepted as part of the constitutional system. For example, the establishment of the President's Cabinet is not stated in the Constitution but has become a recognized tradition that influences how executive power is exercised.
The Supreme Court interprets the meaning of the Constitution and its provisions in relation to modern issues. Through its rulings, the Court can clarify what certain provisions mean in contemporary contexts. For example, in Roe v. Wade (1973), the Supreme Court interpreted the right to privacy under the Constitution to include a woman's right to choose to have an abortion.
Congress can pass laws that impact how certain constitutional provisions are understood and applied. For example, the Civil Rights Act of 1964 expanded the protections against discrimination established by the Constitution.


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