
Article I, Section 8 of the US Constitution enumerates the powers of Congress. It specifies the powers of Congress in great detail, including the power to lay and collect taxes, borrow money, regulate commerce, coin money, establish post offices, protect patents and copyrights, establish lower courts, declare war, and raise and support an Army and Navy. The Article also includes the Necessary and Proper Clause, also known as the Elastic Clause, which allows Congress to make laws necessary and proper to carry out the enumerated powers. The First Congress adopted Amendment X, reserving all powers not specifically granted to the federal government to the states or the people.
| Characteristics | Values |
|---|---|
| Powers | To make laws, lay and collect taxes, borrow money, regulate commerce, coin money, establish post offices, protect patents and copyrights, establish lower courts, declare war, and raise and support an Army and Navy |
| Legislative authority | To enact legislation, confirm or reject Presidential appointments, and investigative powers |
| Legislative process | Anyone can write a bill, but only members of Congress can introduce legislation |
| Limitations | Cannot prohibit the migration or importation of persons into a state prior to 1808 |
| Amendments | A portion of Section 2 was changed by the 14th Amendment, a portion of Section 9 was changed by the 16th Amendment, a portion of Section 3 was changed by the 17th Amendment, and a portion of Section 4 was changed by the 20th Amendment |
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What You'll Learn

Power to declare war
Article I, Section 8, Clause 11 of the U.S. Constitution, also known as the War Powers Clause, grants Congress the power to declare war. This clause is a crucial aspect of the Constitution, as it ensures that the power to make war does not rest in the hands of a single individual, such as the President. Instead, it requires cooperation between the President and Congress, with Congress holding the authority to declare war and the President directing military operations as the Commander-in-Chief.
Historically, there have been instances where American presidents have engaged in military actions without formal declarations of war. Notable examples include the Korean War, the Vietnam War, and the Gulf of Tonkin incident, where President Lyndon Johnson authorised military action without an official declaration. These instances have sparked debates about the appropriate use of executive power and the role of Congress in authorising military engagements.
The War Powers Resolution of 1973 was enacted by Congress to address these concerns. This resolution requires the President to obtain either a declaration of war or an authorisation for the use of military force from Congress. It also mandates the President to notify Congress within 48 hours of committing troops to any military action and to withdraw troops if Congress does not grant an extension.
Despite the War Powers Resolution, debates continue regarding the interpretation of war powers. Some legal scholars argue that offensive military actions taken without a formal declaration of war are unconstitutional, while others defend the President's authority as Commander-in-Chief to defend the country and take necessary actions.
Overall, the power to declare war, as outlined in Article I, Section 8, Clause 11 of the Constitution, remains a fundamental aspect of the U.S. governmental system, shaping how the nation approaches military conflicts and international relations.
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Power to raise and support an army
Article I of the U.S. Constitution, which outlines the powers of Congress, grants Congress the power to "raise and support Armies". This power is further elaborated upon in Article I, Section 8, Clause 12, which states that Congress has the authority to appropriate funds for the army, but with a crucial limitation: "no Appropriation of Money to that Use shall be for a longer Term than two Years".
This limitation was included by the Framers of the Constitution due to a fear of standing armies, as historically similar powers had been used to the detriment of liberties in England. The English King had the power to raise and maintain armies, but the English Declaration of Rights of 1688 stated that the monarch could not maintain a standing army without the consent of Parliament. Thus, the Framers of the U.S. Constitution vested these powers in Congress, aiming to protect the liberties and well-being of citizens.
The power to raise and support an army is distinct from Congress's authority to call forth the militia, and it grants Congress broad constitutional authority to mobilise and regulate armed forces. This power has been affirmed by the Supreme Court, which held that the powers of the states regarding the militia are exercised in subordination to the national government's authority to raise and support armies.
The two-year limitation on appropriations for the army has been interpreted in practice. In 1904, Solicitor-General Hoyt ruled that this provision did not prohibit the government from entering into long-term contracts for equipment and other means necessary for military operations and common defence. This interpretation was upheld by Attorney General Clark in 1948, who agreed that the two-year limitation applied specifically to appropriations for raising and supporting armies in the strict sense of the word "support".
Congress's power to raise and support armies is a significant aspect of its enumerated powers, allowing it to provide for the common defence and security of the nation. It grants Congress the authority to mobilise armed forces and make necessary appropriations, with the limitation of preventing long-term standing armies.
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Power to lay and collect taxes
Article I, Section 8 of the US Constitution enumerates the powers of Congress. This includes the power to lay and collect taxes, duties, imposts, and excises. This power is often referred to as the "Taxing Clause" or the "Power of the Purse."
The Taxing Clause grants Congress the authority to impose taxes, tariffs, and other means of raising federal revenue to fund the government and pay off debts. It also allows Congress to collect these taxes and use them for the common defence and general welfare of the United States. However, there is a requirement that all duties, imposts, and excises must be uniform throughout the country.
The power to tax is one of the most important powers granted to Congress in the Constitution. It gives Congress significant control over the executive branch, as the executive must rely on Congress for funding. This power has been further expanded through amendments to the Constitution, such as the 16th Amendment, which authorized Congress to establish a national income tax.
While Congress has broad authority under the Taxing Clause, there are some limitations. For example, the Constitution originally prohibited direct taxes unless they were apportioned based on each state's population. This restriction was later removed by the 16th Amendment. Additionally, the Supreme Court has issued rulings that have limited Congress's power to tax in certain situations, such as in the case of child labour taxes or taxes related to gun control legislation.
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Power to coin money
Article I, Section 8 of the US Constitution enumerates the powers of Congress. This section specifies the powers of Congress in great detail, and these powers are limited to those listed and those that are "necessary and proper" to carry them out.
Article I, Section 8, Clause 5 of the US Constitution grants Congress the power "To coin Money, regulate the Value thereof, and of foreign Coin, and fix the Standard of Weights and Measures". This power is often referred to as the "coinage power". The Constitution also prohibits the states from coining money. Therefore, the Supreme Court has recognised Congress's coinage power to be exclusive.
The Supreme Court has interpreted Congress's power to coin money and regulate the value thereof to authorise Congress to regulate every phase of currency. For example, Congress may charter banks and endow them with the right to issue circulating notes. It may also restrain the circulation of notes not issued under its own authority. Additionally, the Supreme Court has held that the power to coin money includes the authority to maintain such coinage as a medium of exchange at home and to forbid its diversion to other uses by defacement, melting, or exportation.
Congress's coinage power also extends to abrogating clauses in pre-existing private contracts. The Supreme Court has upheld Congress's authority to abrogate clauses in pre-existing private contracts calling for payment in gold coin or allowing bondholders to elect to be paid in foreign currencies. However, the Supreme Court has held that abrogating clauses in contracts involving obligations of the United States is an unconstitutional use of the coinage power.
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Power to regulate commerce
Article I of the U.S. Constitution outlines the powers of Congress. Article I, Section 8, Clause 3, also known as the Commerce Clause, grants Congress the power "to regulate commerce with foreign nations, among states, and with the Indian tribes".
The Commerce Clause gives Congress broad powers to regulate many aspects of the economy and to pass environmental or consumer protections. This is because much of today's business, in manufacturing or distribution, crosses state lines. The Commerce Clause has been interpreted to mean that Congress has the power to make regular, and even prohibit, the trade, transportation, or movement of people and goods from one state to another, to a foreign nation, or to an Indian tribe.
The Commerce Clause has been used to justify exercising legislative power over the activities of states and their citizens. This has led to significant and ongoing controversy regarding the balance of power between the federal government and the states. The Supreme Court has historically interpreted the Commerce Clause as limiting state power, rather than as a source of federal power. Early cases primarily focused on the meaning of "commerce" while paying less attention to the meaning of "regulate".
In recent years, the Supreme Court has expressed greater concern for states' rights and has issued rulings that limit the power of Congress to pass legislation under the Commerce Clause. For example, in United States v. Lopez (1995), the Supreme Court attempted to curtail Congress's broad legislative mandate under the Commerce Clause by returning to a more conservative interpretation of the clause. The Court held 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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Frequently asked questions
Article I of the Constitution enumerates the powers of Congress.
Article I, Section 8 specifies the powers of Congress in great detail. These include the power to lay and collect taxes, pay debts and borrow money, regulate commerce, coin money, establish post offices, protect patents and copyrights, establish lower courts, declare war, and raise and support an Army and Navy.
The Necessary and Proper Clause, also known as the Elastic Clause, allows Congress to stretch its enumerated powers to make all laws "necessary and proper" to carry out the powers given to any part of the government under the Constitution.









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