
The US Constitution grants Congress a wide range of powers, including the power to lay and collect taxes, duties, imposts, and excises, as well as to regulate commerce with foreign nations and among the states. Congress also has the power to establish laws on naturalization and bankruptcy, and to define and punish crimes committed on the high seas or against the law of nations. Additionally, Congress has the authority to declare war, raise and support armies, and provide for the calling forth of the militia to execute laws, suppress insurrections, and repel invasions. The Constitution further grants Congress the power to make all laws necessary and proper for carrying into execution the foregoing powers and to constitute tribunals inferior to the Supreme Court.
| Characteristics | Values |
|---|---|
| Legislative Powers | Vested in Congress, which consists of a Senate and House of Representatives |
| House of Representatives | Members chosen every second year by the people of the several states |
| Electors in each State | Qualifications requisite for Electors of the most numerous Branch of the State Legislature |
| Age of Representatives | At least 25 years old |
| Citizenship of Representatives | Citizen of the United States for at least 7 years |
| Residence of Representatives | Inhabitant of the State in which they are chosen |
| Taxation | To lay and collect taxes, duties, imposts, and excises |
| Commerce | To regulate commerce with foreign nations, among the several states, and with Indian tribes |
| Naturalization and Bankruptcy | To establish uniform rules of naturalization and bankruptcy laws throughout the United States |
| War and Military | To declare war, grant letters of marque and reprisal, raise and support armies, and provide for calling forth the militia |
| Piracy and Felonies | To define and punish piracies and felonies committed on the high seas and offences against the law of nations |
| Intellectual Property | Power over intellectual property |
| Implied Powers | To make laws necessary and proper for carrying into execution the foregoing powers |
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What You'll Learn

Power to levy and collect taxes
The U.S. Constitution grants Congress the power to levy and collect taxes, duties, imposts, and excises. This power is outlined in Article I, Section 8, Clause 1, also known as the Taxing and Spending Clause. This clause permits the levying of taxes for two primary purposes: to pay off debts and to provide for the common defence and general welfare of the United States.
The power to tax is essential to the effective functioning of the government, as taxes provide the financial resources needed to carry out government actions. The Constitution's framers recognised the importance of this power, placing it first in the list of enumerated powers granted to Congress.
The Taxing Clause grants Congress the authority to assess, levy, and collect taxes without requiring assistance from the states. This was a significant shift from the Articles of Confederation, which only allowed Congress to request or "requisition" states for contributions to the national treasury. The lack of a direct power to tax individuals was a major shortcoming of the young nation's government, leaving it unable to effectively raise funds.
The power to tax granted by the Constitution is broad, but it is not without limitations. The Supreme Court has, at times, curtailed the scope of Congress's taxing power with respect to the manner, objects, and subject matter of taxation. Additionally, the Constitution stipulates that direct taxes must be levied by the rule of apportionment, while indirect taxes are governed by the rule of uniformity.
The Sixteenth Amendment, ratified in 1913, further clarified Congress's power to levy and collect taxes on income, regardless of the source, without the need for apportionment among the states. This amendment was upheld by the Supreme Court in Brushaber v. Union Pacific Railroad in 1916, confirming the constitutionality of income taxes.
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Authority to regulate commerce
The US Constitution grants Congress the power to regulate commerce. This is known as the Commerce Clause, referring to Article 1, Section 8, Clause 3 of the Constitution.
The Commerce Clause gives Congress the authority to "regulate commerce with foreign nations, among states, and with the Indian tribes". This clause has been interpreted broadly, with Congress often using it to justify exercising legislative power over the activities of states and their citizens. This has led to ongoing controversy regarding the balance of power between the federal government and the states.
The Constitution does not explicitly define the word "commerce", leading to debates over the scope of Congress's powers under the Commerce Clause. Some argue that it refers simply to trade or exchange, while others claim that it describes a broader category of commercial and social intercourse between citizens of different states.
Throughout much of US history, courts have taken a broad interpretation of the Commerce Clause. In 1824, the Supreme Court ruled in Gibbons v. Ogden that intrastate activity could be regulated under the Commerce Clause if it was part of a larger interstate commercial scheme. In 1905, the Supreme Court held in Swift and Company v. United States that Congress had the authority to regulate local commerce as long as it was part of a continuous "current" of commerce involving the interstate movement of goods and services.
However, there have also been periods where the interpretation of the Commerce Clause has narrowed. For example, between 1905 and 1937, during what became known as the Lochner era, courts experimented with the idea that the Commerce Clause does not empower Congress to pass laws that impede an individual's right to enter a business contract. More recently, in United States v. Lopez (1995), the Supreme Court attempted to curtail Congress's broad legislative mandate under the Commerce Clause by adopting a more conservative interpretation, holding that Congress only has the power to regulate the channels of commerce, the instrumentalities of commerce, and actions that substantially affect interstate commerce.
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Declare war
The U.S. Constitution grants Congress the power to declare war. Article I, Section 8 specifically lists this as a power of Congress, stating that "Congress shall have power to ... declare War." The extent to which this clause limits the President's ability to use military force without Congress's approval is highly contested. However, most people agree that it grants Congress an exclusive power, meaning that presidents cannot declare war on their own authority.
The Declare War Clause has been interpreted to mean that Congress has the power to initiate hostilities. This interpretation is supported by the fact that the phrase "make war" was changed to "declare war" in the Federal Convention of 1787 to leave the power to repel sudden attacks to the executive branch, but not the power to commence war. In the early post-ratification period, many key founders, including Alexander Hamilton, George Washington, and James Madison, referred to the clause as an important limit on presidential power.
Congress has formally declared war on five separate occasions, issuing declarations against ten different foreign nations. Four of these five declarations came after hostilities had already begun. The first formal declaration occurred on June 18, 1812, when the United States declared war against the United Kingdom, citing British impressment of American sailors and violations of U.S. neutrality during the Napoleonic Wars. This conflict, known as the War of 1812, concluded with the Treaty of Ghent in 1814.
On May 13, 1846, Congress declared war on Mexico at the request of President James K. Polk, following territorial disputes and military clashes in Texas. The Mexican-American War resulted in the Treaty of Guadalupe Hidalgo in 1848, which expanded U.S. territory. During World War I, the United States declared war on Germany on April 6, 1917, citing unrestricted submarine warfare and the Zimmermann Telegram, in which Germany attempted to persuade Mexico to join the war against the United States. Later that year, on December 7, 1917, Congress also declared war on Austria-Hungary, a German ally.
World War II saw the most formal war declarations by the United States. Following the attack on Pearl Harbor on December 7, 1941, Congress declared war on Japan the next day, with near-unanimous approval. In response, Nazi Germany and Italy declared war on the United States, prompting reciprocal declarations by Congress against both nations.
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Raise and support armies
Constitutions are a set of laws that embody the ideals of a state and determine how an entity is governed. They can be written down into a single document, multiple documents, or be unwritten. The US Constitution is a written constitution, granting specific powers to Congress.
One such power is the ability to "raise and support Armies". This power allows Congress to establish and maintain a standing army, with the necessary funding and resources. This includes recruiting, training, and equipping soldiers, as well as providing for their welfare and discipline.
Congress can also call upon the Militia to assist the regular Army in times of need. The Militia Act of 1792, for instance, allowed for the calling forth of the Militia to execute the laws of the Union, suppress insurrections, and repel invasions.
However, the Constitution places a limit on this power by restricting the appropriation of money for the Army to a maximum of two years. This means that funding for the Army must be regularly reviewed and approved by Congress, ensuring a balance between military power and civilian control.
This power to "raise and support Armies" is a critical aspect of the US Constitution, ensuring the nation's defence and security while maintaining a system of checks and balances to prevent the abuse of military power.
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Make all necessary laws
Article I, Section 8 of the US Constitution grants Congress the power "to make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof". This is often referred to as the Necessary and Proper Clause.
This clause gives Congress the authority to create laws that are essential for executing the powers granted to them by the Constitution and for governing the country effectively. It allows Congress to address issues that may not be specifically mentioned in the Constitution but are still necessary for the functioning of the government and the nation as a whole.
The Necessary and Proper Clause is a broad grant of power to Congress, allowing it to legislate on a wide range of topics. For example, Congress can pass laws related to national defence, economic policy, and interstate commerce, as these are all areas where federal legislation is often necessary to carry out the powers vested in the government.
However, the interpretation and application of the Necessary and Proper Clause have been the subject of debate and legal challenges over the years. Some argue that Congress should not delegate its lawmaking powers to other branches of government, while others believe that Congress has the flexibility to delegate authority as long as it serves the purpose of executing constitutional powers effectively.
Ultimately, the Necessary and Proper Clause empowers Congress to make laws that are essential for governing the country and carrying out the duties outlined in the Constitution. It provides Congress with the flexibility to address a wide range of issues, ensuring that the government can adapt to new challenges and circumstances.
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Frequently asked questions
The Constitution grants Congress the power to raise and support armies, regulate commerce with foreign nations, and provide for the common defence and general welfare of the United States.
Implied powers are not specifically stated in the Constitution but may be inferred from the Necessary and Proper Clause (Clause 8). This clause gives Congress the right to “make all laws which shall be necessary and proper for carrying into execution the foregoing powers".
The Constitution limits Congress's powers by prohibiting the delegation of certain functions, such as the power to adopt rules having the effect of law or the power to pass statutes. The non-delegation principle reinforces the limited and enumerated powers of Congress, which help preserve individual liberty.

























