
The United States Constitution outlines several limitations on Congress's power to pass laws. These restrictions are outlined in Article I, Section Nine, and include prohibitions on passing specific types of laws, such as bills of attainder or ex post facto laws, and imposing certain types of taxes, such as direct taxes on people or taxes on goods transported between states. Additionally, Congress cannot grant titles of nobility, spend money without appropriate laws, or show preference to specific ports or states. These limitations ensure a balanced distribution of power and protect the rights of citizens and states.
| Characteristics | Values |
|---|---|
| Taxation | No direct taxation of citizens without a census or enumeration |
| Taxation | No taxation on goods exported from one state to another |
| Ports | No preference for ports of one state over another |
| Spending | No money to be spent without passing an Appropriations law |
| Titles | No titles of nobility to be granted |
| Officers | No officers of the US to accept titles, offices, or payments from other countries |
| Prisoners' rights | No suspension of the "writ of habeas corpus" |
| Bills | No Bill of Attainder or ex post facto Law to be passed |
| Contracts | No law impairing the obligation of contracts |
| Coinage | No state can coin money or issue bills of credit |
| Treaties | No state can enter into treaties, alliances, or confederations without Congress's consent |
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What You'll Learn

Congress cannot convict without trial
Congress is subject to certain limitations, which are outlined in Article I, Section Nine of the US Constitution. One such limitation is that Congress cannot convict a person without a trial. This is a fundamental aspect of the US justice system and is enshrined in the Constitution's provisions on impeachment.
Impeachment is the process by which Congress charges and tries an official of the federal government for "Treason, Bribery, or other high Crimes and Misdemeanors." The House of Representatives first investigates through an impeachment inquiry and then impeaches an official by approving, with a simple majority vote, articles of impeachment. These articles of impeachment constitute the formal allegation(s) and, upon their passage, the defendant has been "impeached."
The second stage of impeachment is the trial, which is conducted by the Senate. The Senate sits as a High Court of Impeachment, considering evidence, hearing witnesses, and voting to acquit or convict the impeached official. The Senate requires a two-thirds supermajority to convict a person being impeached. The impeached official has the right to mount a defence with their own attorneys. After the trial, the Senate enters judgment on its decision, whether to convict or acquit, and a copy of the judgment is filed with the Secretary of State.
While Congress can investigate conduct that may be criminal, it cannot bring criminal charges or initiate criminal prosecutions. If a congressional investigation uncovers evidence of criminal activity, Congress may refer the matter to the Department of Justice for further investigation and potential prosecution. Congress's investigative authority is limited by the doctrine of separation of powers, which prevents it from usurping the power of another branch of government. For example, Congress cannot investigate matters within the President's discretion, such as an individual's entitlement to a pardon.
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No laws favouring one state's ports
Article I, Section 9 of the US Constitution outlines several limitations on Congress, including the specific clause that "no preference shall be given by any regulation of commerce or revenue to the ports of one state over those of another". This clause ensures that Congress cannot pass laws that favour the ports of one state over another, promoting equality among the states.
The clause prohibits any form of preferential treatment for specific state ports, including taxation advantages or regulatory exemptions. It also prevents Congress from imposing additional taxes or duties on vessels entering or exiting a particular state's ports. This means that ships travelling from one state to another are not required to pay any form of duty or tariff when using another state's port facilities. This provision ensures that all states' ports are treated equally in terms of taxation and regulatory requirements, creating a level playing field for interstate commerce.
The clause also prevents Congress from enacting laws that would require vessels to obtain special clearance or permits when travelling between states. This ensures that ships can move freely and efficiently between states without unnecessary bureaucratic obstacles. By prohibiting Congress from creating preferential policies for specific state ports, this clause helps to maintain a fair and competitive environment for all states in the realm of maritime trade and commerce.
Additionally, this clause is designed to prevent economic discrimination against any state and to foster a unified national economy. By ensuring that Congress cannot use its legislative power to favour certain state ports over others, this clause promotes a balanced approach to economic development across the country. It also reinforces the federal nature of the United States by preventing Congress from unduly interfering in interstate commerce and respecting the autonomy of individual states in managing their ports and maritime activities.
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No direct taxes without census
Article I, Section Nine of the US Constitution outlines several limitations on Congress, including the requirement that direct taxes be levied in proportion to the census or enumeration of the population. This provision, often referred to as the "No direct taxes without census" rule, is designed to ensure that taxation is fair and equitable among the states.
The rule states that "No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or Enumeration herein before directed to be taken." In other words, Congress is prohibited from imposing a direct tax on the people unless those taxes are proportional to the population of each state. This requirement ensures that each state pays its fair share of taxes based on its representation in Congress.
The census, conducted once every ten years, provides an official count of the population in each state. This data is used to determine the number of representatives each state is entitled to in the House of Representatives, as well as the allocation of federal funds and resources. By requiring taxes to be levied in proportion to the census, this rule ensures that states with larger populations contribute more in taxes, reflecting their greater representation and utilization of resources.
However, it is important to note that the 16th Amendment to the Constitution grants Congress the power to "lay and collect taxes on incomes, from whatever source derived, without apportionment among the several states, and without regard to any census or enumeration." This amendment effectively overrides the "No direct taxes without census" rule, allowing Congress to impose income taxes and other types of direct taxes without strictly adhering to the census-based proportionality requirement. Nonetheless, the original principle of ensuring equitable taxation among the states continues to guide tax policy and legislative decisions.
In conclusion, the "No direct taxes without census" rule, enshrined in Article I, Section Nine of the US Constitution, serves as an important check on Congressional power. By requiring direct taxes to be levied in proportion to the census, this rule ensures that taxation is fair and representative of the population distribution across the states. While the 16th Amendment has granted Congress additional flexibility in taxation, the spirit of this limitation persists, influencing tax policy and fostering a sense of equity among Americans.
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No titles of nobility
The United States Constitution prohibits Congress from granting titles of nobility. This is known as the Title of Nobility Clause, which is outlined in Article I, Section 9, Clause 8. The clause states that "no Title of Nobility shall be granted by the United States". This clause is reinforced by the corresponding prohibition on state titles of nobility in Article I, Section 10, and by the Republican Guarantee Clause in Article IV, Section 4.
The Title of Nobility Clause is based on the principle of equality and the belief that titles of nobility have no place in a just and equal society. The framers of the Constitution intended to prevent the establishment of a society of nobility in the United States and to protect the republican form of government. Thomas Paine, a noted critic of nobility, wrote that "dignities and high-sounding names have different effects on different beholders. The lustre of the Star and the title of My Lord, over-awe the superstitious vulgar, and forbid them to inquire into the character of the possessor".
The exact interpretation of the Title of Nobility Clause is still debated, with some arguing that it only prohibits a federal system of hereditary privilege similar to the British aristocratic system. However, others suggest that its scope extends beyond the narrow meaning of nobility under English law and could include, for example, admission preferences for legacy students at state universities or certain benefits that accompany the receipt of the Medal of Honor.
In addition to the Title of Nobility Clause, the Foreign Emoluments Clause, also known as the Titles of Nobility Clause, prohibits federal officials from receiving gifts, emoluments, offices, or titles from foreign states or monarchies without the consent of Congress. This clause is designed to protect federal officeholders from "corrupting foreign influences".
To further reinforce the importance of equality and the rejection of nobility, the Articles of Confederation of 1781 stated that "nor shall the United States in Congress assembled, or any of them, grant any title of nobility". This early governing framework also prohibited any person holding an office of profit or trust under the United States from accepting any title of any kind from any king, prince, or foreign state.
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No banning of habeas corpus
The writ of habeas corpus is a legal procedure that protects individuals from unlawful detention by the state. It is a fundamental human right that has existed in some form for centuries, with its origins often traced back to the Magna Carta of 1215. However, it actually predates this, stemming from the Assize of Clarendon of 1166 during the reign of Henry II of England.
The writ of habeas corpus allows a prisoner, or someone acting on their behalf, to petition a court or a judge to review the legality of their detention. If the court finds that the detention is unlawful, it can order the prisoner's release. This right is an important safeguard against arbitrary imprisonment and ensures that the state cannot detain individuals without proper authority.
In the United States, the right to petition for a writ of habeas corpus is specifically protected by the Suspension Clause of the United States Constitution. This clause, found in Article One, Section 9, states that "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." This means that Congress cannot pass laws that ban or suspend the right to habeas corpus, except in very limited circumstances where there is a direct threat to public safety.
Throughout history, there have been several notable instances where the writ of habeas corpus was suspended or restricted. For example, during the Civil War, President Lincoln suspended habeas corpus for prisoners of war, spies, traitors, and military personnel. This suspension was later overturned by the U.S. Circuit Court of Appeals, which asserted that only Congress had the power to suspend habeas corpus. More recently, the Antiterrorism and Effective Death Penalty Act of 1996 placed certain restrictions on habeas petitions from state prisoners, but these restrictions were found to be within the bounds of the Suspension Clause.
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Frequently asked questions
No, Congress cannot pass such a law.
No, Congress cannot spend money unless a law has been passed allowing it to spend money, and a regular statement of the treasury account must be published from time to time.
No, Congress cannot pass such a law.
Congress was not allowed to ban the importation of slaves until 1808.




































