
The United States Congress is made up of the House of Representatives and the Senate and has a wide range of powers. However, there are some things that Congress cannot do. For example, Congress cannot override a pocket veto, where a bill remains unsigned by the President when Congress is no longer in session. Congress also cannot usurp the power of another branch of government, nor can it investigate matters where the means of redress are purely judicial or matters committed to the President's discretion. Additionally, Congress cannot grant titles of nobility or accept presents, emoluments, offices, or titles from foreign states without the consent of Congress.
| Characteristics | Values |
|---|---|
| Taxing interstate trade | Congress cannot tax things sold from one state to another state |
| Preferential treatment of ports | Congress cannot prefer one port over another, and no ships from one state can get taxed for using another state’s port |
| Spending money | Congress cannot spend money unless a law has been passed allowing it to spend money, which must be made public regularly |
| Granting titles | Congress cannot grant titles of nobility, and no officer of the United States can accept any title, office, or payment of any kind from any other country |
| Prohibiting the migration or importation of persons | Congress cannot prohibit the migration or importation of persons prior to the year 1808, but a tax or duty not exceeding $10 per person may be imposed |
| Suspending the writ of habeas corpus | The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it |
| Passing certain laws | No Bill of Attainder or ex post facto Law shall be passed |
| Taxing citizens | No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or enumeration |
| Taxing exports | No Tax or Duty shall be laid on Articles exported from any State |
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What You'll Learn

Congress can't tax goods sold from one state to another
Congress is bound by a set of limitations outlined in Article I, Section Nine of the US Constitution. One of these limitations is that Congress cannot tax goods sold or exported from one state to another. This is known as the Import-Export Clause or the Export Clause.
The Export Clause, as outlined in Article I, § 9, Clause 5 of the US Constitution, states that "No Tax or Duty shall be laid on Articles exported from any State". This means that Congress cannot impose taxes on goods that are sold or exported across state lines. This clause was proposed by southern states, who feared that northern states would dominate Congress and use taxes on exports to raise a disproportionate amount of revenue for the federal government from the south.
The Import-Export Clause is related to the Export Clause and is outlined in Article I, § 10, Clause 5 of the US Constitution. This clause prevents states from imposing tariffs on imports and exports without the consent of Congress. The Import-Export Clause has been interpreted by the Supreme Court to only apply to imports and exports with foreign nations and not between states. However, this interpretation has been questioned by modern legal scholars.
The Supreme Court has also ruled on the applicability of the Export Clause in specific cases. In United States v. IBM (1996), the Court determined that the Export Clause prohibits even non-discriminatory taxes on exported goods and related services and activities. This case built on previous rulings in Thames & Mersey Marine Insurance Co. v United States (1915) and Fernandez v. Wiener (1945), which held that insurance during the voyage of exported goods is a necessity and that taxing these policies is a burden on exporting.
In addition to the limitations on taxing interstate commerce, Congress is also prohibited from showing preference to one state's ports over another. This includes prohibiting the taxation of ships from one state using the ports of another state.
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Congress can't spend money without passing a law
The Constitution of the United States is very clear that no money can be spent by Congress without passing a law. This is known as the Appropriations Clause, which states that "No Money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law". This clause is not a grant of legislative power, but rather a limitation, as Congress has the power to specify the objects, amounts, and timing of federal spending. This is what is known as the "power of the purse".
The Appropriations Clause requires that any spending of public funds be authorised by a law that specifies the purpose, powers, and activities for which the funds may be used. This is to ensure that federal spending is aligned with the priorities and objectives outlined in the legislation. In other words, Congress decides how much money is spent and on what, and this decision must be made public regularly.
The power of the purse has been a source of conflict between the executive and legislative branches of the US government. There have been several notable instances where presidents have refused to spend funds approved by Congress, known as "impoundment". This practice dates back to Thomas Jefferson, the third president of the United States, and has been utilised by presidents such as Richard Nixon and Donald Trump. In the 1970s, Nixon refused to spend funds on numerous programs approved by Congress, leading to accusations that he was using impoundment powers to veto programs by cutting off their funding.
The Line Item Veto Act of 1996 was an attempt to give the president more flexibility in controlling how funds allocated by Congress are spent. This act allowed the president to cancel specific appropriations and spend less than Congress had instructed. However, the Supreme Court struck down the line-item veto, stating that it was unconstitutional and gave the president the ability to amend the law.
In summary, Congress has the power of the purse and cannot spend money without passing a law, known as the Appropriations Clause. This clause ensures that federal spending is aligned with the priorities and objectives outlined in legislation and maintains a balance between the executive and legislative branches of the US government.
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Congress can't give titles of nobility to anyone
The Constitution of the United States expressly prohibits Congress from granting titles of nobility. This prohibition is enshrined in Article I, Section 9, Clause 8, also known as the Title of Nobility Clause, which states that "No Title of Nobility shall be granted by the United States".
The Title of Nobility Clause reflects the American aversion to aristocracy and the republican character of the US government. The framers of the Constitution intended to prevent the establishment of a hereditary monarchy or nobility, ensuring that the government remains a representative democracy governed impartially.
The Supreme Court has affirmed the self-explanatory nature of the Title of Nobility Clause, with early mentions in Supreme Court opinions treating its meaning as inherent. In the Federalist Papers, Alexander Hamilton and James Madison emphasised the decisive proof of the republican complexion of the system in its absolute prohibition of titles of nobility.
The prohibition on titles of nobility extends beyond Congress, as no officer of the United States can accept any title, office, or payment from any other country without congressional consent. This ensures that American officials are not unduly influenced by foreign powers or enticed by the prospect of personal gain.
While the Title of Nobility Clause has seen limited interpretation by the courts, a few notable cases have addressed its scope and implications. For example, in State v. Larson (1988), the court held that the issuance of driver's licenses by a state did not confer a title of nobility. This decision underscores the court's interpretation of the clause as pertaining specifically to titles of nobility and not to other forms of recognition or accreditation.
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Congress can't ban the slave trade before 1808
Congress is the legislative branch of the United States government, responsible for making laws. However, it does have limitations on its powers, as outlined in the Constitution. One notable example of a restriction on Congress's authority was the inability to ban the slave trade before 1808.
The Act to Prohibit the Importation of Slaves, passed on March 2, 1807, was a landmark piece of legislation that aimed to end the international slave trade. The act, which went into effect on January 1, 1808, prohibited the importation of slaves into any port or place within the jurisdiction of the United States. This legislation was a significant step towards the eventual abolition of slavery in the United States, but it is important to note that it did not abolish the domestic slave trade or the practice of slavery within the country.
The reason Congress could not ban the slave trade before 1808 was due to a specific clause in Article I, Section 9 of the Constitution, which stated that "the Migration or Importation of such Persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight". This clause was likely included due to the economic dependence of the Southern states on slavery at the time, particularly with the invention of the cotton gin in 1793, which made cotton a major industry and sharply increased the demand for enslaved labour.
Despite the eventual passage of the Act to Prohibit the Importation of Slaves, it is important to acknowledge that it did not bring an immediate end to the slave trade. Even after 1808, enslaved persons continued to be brought into the nation illegally, and the widespread trade of enslaved people within the South persisted. Additionally, it is worth noting that this act did not address the broader issue of slavery itself, as the domestic slave trade remained legal, and the children of enslaved people automatically became enslaved, ensuring a self-sustaining population.
In conclusion, while Congress played a crucial role in passing legislation to prohibit the importation of slaves, it was constitutionally restricted from doing so before 1808. This delay highlights the complex and contentious nature of the issue of slavery in the early United States and the challenges faced in the path towards its eventual abolition.
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Congress can't suspend the writ of habeas corpus
Congress is bound by certain limitations, as outlined in Article I, Section Nine of the US Constitution. One such limitation is that Congress cannot suspend the writ of habeas corpus, except in cases of rebellion or invasion when public safety is at risk. This is known as the Suspension Clause, which protects the privilege of the writ of habeas corpus.
The writ of habeas corpus is a legal procedure that safeguards individuals' liberty by preventing unlawful imprisonment. It allows a prisoner, or someone acting on their behalf, to challenge the legality of their detention and request a court hearing to determine if they are being held lawfully. The Suspension Clause acts as a restraint on the government's power to suspend this right, ensuring that individuals can seek habeas relief even if the privilege of the writ is suspended.
Throughout history, there have been instances where the writ of habeas corpus was suspended. Notably, President Abraham Lincoln unilaterally suspended it during the Civil War, provoking opposition and ultimately requiring congressional authorization. Since the Constitution was ratified, there have been four suspensions of the writ: during the Civil War, in certain counties in South Carolina during Reconstruction, in two provinces of the Philippines during an insurrection in 1905, and in Hawaii after the bombing of Pearl Harbor.
The Suspension Clause has been the subject of much debate and interpretation by the Supreme Court. In the case of Ex parte Milligan (1866), the Court asserted that only the privilege of the writ is suspended, not the writ itself. This distinction allows the issuing court to determine the constitutionality of the suspension and whether the petitioner falls within the scope of the suspension. The Court has also ruled that the Suspension Clause guarantees prisoners a forum to challenge their detention, as seen in Boumediene v. Bush (2008).
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Frequently asked questions
Congress cannot pass a bill if the President vetoes it and Congress is no longer in session. This is called a pocket veto and cannot be overridden.
Congress cannot assemble less than once a year. The default meeting date is the first Monday in December, but Congress can appoint a different date if required.
Congress cannot prohibit the migration or importation of persons into a state prior to 1808, but a tax or duty of up to $10 per person could be imposed.






































