
The postal system in the United States is established by the Constitution, which grants Congress the power to create and manage it. Article I, Section 8 of the Constitution, also known as the Postal Clause, gives Congress the authority to establish Post Offices and post Roads and enact laws necessary for their functioning. This includes the ability to control land for postal roads and construct postal facilities. The Supreme Court has affirmed Congress's 'broad power' over the postal system and has helped shape the understanding of the Postal Clause through various rulings. The postal system has undergone significant changes over time, including its reorganization as an independent agency in 1970, granting postal workers collective bargaining rights and the authority to set postal rates and salaries.
| Characteristics | Values |
|---|---|
| Postal Clause | Article I, Section 8, Clause 7 of the United States Constitution |
| Postal Power | Includes the power to designate certain materials as non-mailable and pass statutes criminalizing abuses of the postal system |
| Postal System | An independent establishment of the executive branch |
| Postal Reorganization Act | Passed in 1970, allowing letter carriers and other postal workers the right to engage in collective bargaining |
| Postal Crisis | In 2020, postal workers were banned from making extra trips to ensure on-time mail delivery, and high-speed mail-sorting machines and public collection boxes were removed |
| Postal Laws | The Supreme Court struck down postal laws that limited free expression, particularly political materials |
| Postal Roads | Congress has the power to construct new postal facilities and roads, or select from existing roads |
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What You'll Learn

The Postal Clause gives Congress the power to establish post offices and roads
The Postal Clause, outlined in Article I, Section 8 of the United States Constitution, grants Congress the power to establish a postal system, including the creation of post offices and roads. This clause, ratified in 1789, states that Congress has the authority to "establish Post Offices and post Roads" and "make all Laws which shall be necessary and proper" for executing this task.
The Framers' understanding of postal services was influenced by the British postal system, from which terms like "posts", "post roads", "postmaster", and "post offices" were adopted. The British imported their postal system to Colonial America in 1692, appointing a postmaster for the colonies. The Articles of Confederation, which preceded the Constitution, included a clause for establishing a federal post office, but it took several years for the founding fathers to implement it.
The Postal Clause gives Congress broad powers over the postal system, including the ability to control land for "post roads" and the construction of buildings necessary for maintaining a mail delivery system. This power has been interpreted to include the authority to seize private land for post offices and to designate certain materials as non-mailable, such as excluding obscene content and banning lottery circulars.
The Supreme Court has played a significant role in shaping the understanding of the Postal Clause. For example, in Searight v. Stokes, the Court confirmed Congress's duty to transport mail and enter into agreements with states regarding the use and maintenance of roads for postal services. In the 20th century, the Court took a more assertive approach in striking down postal laws that limited free expression, particularly political materials.
The Postal Reorganization Act of 1970 transformed the federal postal service into an independent agency, granting letter carriers and postal workers the right to engage in collective bargaining. This act also gave the new agency the authority to set postal rates and salaries.
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The postal system's roots in the Articles of Confederation
The Articles of Confederation, agreed upon by the United States in 1781, included a clause for establishing a federal post office. The Articles gave Congress the "sole and exclusive right and power" to establish and regulate post offices from one state to another throughout the United States.
The Articles of Confederation also allowed Congress to set postage rates to cover the expenses of the postal system. This power to establish post offices and post roads, or routes, was later included in the US Constitution, which was ratified in 1788. Article I, Section 8, Clause 7 of the Constitution states that "The Congress shall have Power ... To establish Post Offices and post Roads".
The founding fathers took several years to implement a postal system, but today the United States enjoys a robust postal service because Congress had the enumerated powers to establish post offices and post roads. The Postal Clause has been interpreted to include the power to designate certain materials as non-mailable and to pass statutes criminalizing abuses of the postal system, such as mail fraud and armed robbery of post offices.
The Postal Reorganization Act of 1970 transformed the federal postal service by making the US Post Office Department an independent agency, giving letter carriers and other postal workers the right to collective bargaining, and granting the new agency the authority to set postal rates and salaries. While the Constitution does not mandate the operation of a postal system, it does provide Congress with the power to establish one, and the Supreme Court has helped shape the understanding of the Postal Clause over the years.
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The postal system's independence from the executive branch
The United States Postal Service has its roots in the US Constitution, which grants Congress the power to establish a postal system. Article I, Section 8, Clause 7 of the Constitution, known as the Postal Clause, states that "The Congress shall have Power... To establish Post Offices and post Roads". This clause gives Congress exclusive power over the postal system, including the ability to control land for postal roads and the construction of buildings needed to maintain a mail delivery system.
However, the postal system has undergone significant changes since its establishment. Initially, the postal system was influenced by the British postal system, with terms like "posts", "post roads", "postmaster", and "post offices" adopted from it. In the early 18th century, the postal system became a sovereign function, as it was considered a necessary means of communication for the government. During the 1800s, there was a debate over the federal government's ability to acquire land and buildings for post offices, which was settled by the Supreme Court in Kohl v. United States (1875).
The Postal Reorganization Act of 1970 brought about a major change to the postal system's structure. The US Post Office Department was transformed from being part of the President's Cabinet to an independent agency, no longer under the direct control of the executive branch. This gave postal workers the right to collective bargaining and granted the new agency the authority to set postal rates and salaries.
The Supreme Court has played a crucial role in shaping the understanding of the Postal Clause. In cases such as Searight v. Stokes, the Court confirmed Congress's duty to transport mail and enter into agreements with states regarding postal infrastructure. The Court has also addressed the limits of congressional power, as seen in Lamont v. Postmaster General, where it struck down a provision of the Postal Service Salary Act of 1962 that unconstitutionally restricted the First Amendment rights of addressees.
Despite the postal system's independence from the executive branch, it still faces criticism and legal challenges. In recent years, there have been controversies over directives from postal officials, and voters and voting organizations have filed lawsuits challenging obstacles to absentee voting, such as ballot deadlines and the lack of prepaid postage. The Supreme Court has affirmed Congress's responsibility for the postal system, but the idea of postal service privatization has also been discussed.
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The Supreme Court's role in shaping the postal clause
Article I, Section 8, Clause 7 of the United States Constitution, also known as the Postal Clause or the Postal Power, empowers Congress "To establish Post Offices and post Roads". The Postal Clause was added to the Constitution to facilitate interstate communication and create a revenue source for the early US. The Framers' understanding of postal services was influenced by the British postal system, from which they adopted terms like "posts", "post roads", "postmaster", and "post offices".
The US Supreme Court has played a significant role in shaping the interpretation and application of the Postal Clause over the past 235 years. In the early 19th century, the Court interpreted the Postal Clause narrowly, holding that Congress's power consisted mainly of designating roads and sites for postal purposes. However, over time, the Court allowed for the appropriation of land for postal purposes.
In Searight v. Stokes, the Supreme Court confirmed that Congress was responsible for transporting mail based on the Postal Clause. This decision gave Congress the authority to enter into agreements with states regarding the use and maintenance of roads for postal services. The Court also recognised that the Postal Clause grants Congress implied powers, such as protecting the mail.
In the mid-20th century, the Supreme Court shifted its stance on the Postal Clause and began to strike down postal laws that limited free expression, particularly those related to political materials. For example, in Lamont v. Postmaster General, the Court struck down a provision of the Postal Service Salary Act of 1962 that required the Postmaster General to detain and deliver only upon the addressee's request unsealed foreign mail containing communist propaganda. The Court deemed this Act unconstitutional as it imposed limitations on the addressee's First Amendment rights to receive information.
The Postal Reorganization Act of 1970 was a significant development, transforming the US Post Office Department into an independent agency, the United States Postal Service (USPS). This change gave letter carriers and postal workers the right to engage in collective bargaining and granted the new agency the authority to set postal rates and salaries. The Supreme Court recognised Congress's "broad power" over postal matters, as seen in the 1878 Ex parte Jackson decision, where the Court upheld Congress's power to exclude certain items from being mailed through the USPS.
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The postal system's power to seize private land
Article I, Section 8, Clause 7 of the United States Constitution, also known as the Postal Clause or the Postal Power, grants Congress the power to establish post offices and post roads. This includes the authority to control land for "post roads" to carry the mail and the buildings needed to maintain a mail delivery system. The Postal Clause was added to the Constitution to facilitate interstate communication and create a revenue source for the early US.
The Postal Power also includes the ability to designate certain materials as non-mailable and to pass statutes criminalizing abuses of the postal system, such as mail fraud and armed robbery of post offices. This power has been used by Congress and the Postmaster General to exclude obscene materials from the mail, such as lottery circulars and, later, political materials.
During the 1800s, there was a debate over the federal government's ability to acquire buildings and roads for post offices, which was settled by the Supreme Court in Kohl v. United States (1875). Justice William Strong affirmed the government's power to seize private land for a post office and customs house under the doctrine of "eminent domain," in line with the Fifth Amendment's Takings Clause. Eminent domain is the power of the state or federal government to take private land for public use without the landowner's consent. While controversial, it is critical to the development of individual property rights and government services.
The interpretation of "public use" has evolved to include not only direct government usage but also private usage that benefits the public, such as transportation projects, park projects, and public structures like schools. The federal government's power of eminent domain has been upheld by the Supreme Court in cases involving the construction of a post office and the economic revitalisation of a district, demonstrating the broad scope of its authority.
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Frequently asked questions
Yes, the United States Constitution gives Congress the power to establish a postal system.
Article I, Section 8, Clause 7 of the United States Constitution states: "The Congress shall have Power... To establish Post Offices and post Roads".
The Postal Clause has its roots in the Articles of Confederation, which preceded the Constitution. The Articles stated that the government "shall also have the sole and exclusive right and power... of establishing or regulating post offices from one State to another". During the 1787 Constitutional Convention, the Committee of Detail crafted language that gave the federal legislature the right to create post offices and "post-roads".
The Postal Clause gives Congress the power to control land for "post roads" to carry the mail, and the buildings needed to maintain a mail delivery system. It also includes the power to designate certain materials as non-mailable and to pass statutes criminalizing abuses of the postal system.
Yes, the Supreme Court has helped shape the understanding of the Postal Clause over the years. For example, in Searight v. Stokes, the Court confirmed that Congress was charged with transporting mail based on the Postal Clause. In 1981, the Court also took up a constitutional challenge to a federal law prohibiting the placement of unstamped "mailable matter" in mailboxes.

























