
The US Constitution is the supreme law of the United States of America. It consists of a preamble, seven articles, and 27 amendments. The first 10 amendments are known as the Bill of Rights. The US Constitution outlines the frame of the federal government, which is divided into three branches: the legislative, consisting of the bicameral Congress (Article I); the executive, consisting of the president and subordinate officers (Article II); and the judicial, consisting of the Supreme Court and other federal courts (Article III). The constitution also includes provisions such as the Territorial Clause, which gives Congress the power to govern non-state territories, and the Full Faith and Credit Clause, which requires states to recognize the official acts and judicial proceedings of other states. The Fourth Amendment prohibits unreasonable searches and seizures, while the Eighth Amendment protects people from excessive bail or cruel and unusual punishment. The Fourteenth Amendment granted citizenship to former slaves and imposed new limits on state power, and the Nineteenth Amendment prohibits denying citizens the right to vote based on sex.
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What You'll Learn

The US Constitution is the supreme law
The first three articles embody the doctrine of the separation of powers, dividing the federal government into three branches: the legislative, consisting of the bicameral Congress (Article I); the executive, consisting of the President and subordinate officers (Article II); and the judicial, consisting of the Supreme Court and other federal courts (Article III).
Article IV deals with relations between the states and privileges of state citizens. It includes the full faith and credit clause, which requires states to recognize the official acts and judicial proceedings of other states. It also guarantees a republican form of government for each state. Article V outlines the process for amending the Constitution, and Article VI embodies concepts of federalism, describing the rights and responsibilities of state governments and their relationship to the federal government.
The US Constitution guarantees relatively few rights compared to the constitutions of other countries, and it has been described as one of the most difficult constitutions in the world to amend. The Fourteenth Amendment, for example, was a significant expansion of constitutional protections, granting citizenship to former slaves and all persons "subject to US jurisdiction," as well as imposing new limits on state power.
The Constitution also includes provisions for the operation of the federal government, such as the power to declare war, raise and support armies, and regulate commerce with foreign nations and between states. It establishes the power of Congress to make rules for disposing of federal property and governing non-state territories.
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Separation of powers
The US Constitution establishes three separate but equal branches of government: the legislative branch, the executive branch, and the judicial branch. The separation of powers is a well-known concept derived from the text and structure of the Constitution.
The legislative branch makes the law, the executive branch enforces the law, and the judicial branch interprets the law. The Framers structured the government in this way to prevent any one branch from becoming too powerful and to create a system of checks and balances. This system ensures an interplay of power among the three branches, with each branch having certain powers that relate to the others.
The legislative branch, consisting of the Senate and the House of Representatives, has the power to make laws and is responsible for proposing, amending, and passing legislation. The executive branch, led by the President, is responsible for enforcing the laws made by the legislative branch. The President is the Commander-in-Chief of the military, has the power to make treaties and appointments, and is responsible for ensuring the faithful execution of laws. However, Congress can restrict the President's power through impeachment and by writing legislation that restrains executive officials to their duties.
The judicial branch, consisting of the courts, interprets the laws and has the power of judicial review, which allows them to rule on the constitutionality of laws. The Supreme Court, as the highest court in the land, has the final say in interpreting the Constitution and has played a crucial role in upholding the separation of powers. For example, in Immigration and Naturalization Service v. Chadha (1983), the Supreme Court affirmed the procedure requiring every bill passed by Congress to be presented to the President for approval, ensuring the separation of powers between the legislative and executive branches.
The separation of powers is not always strictly observed, and there may be instances of overlap or encroachment. However, the healthy tensions among the branches have been described as having a stabilizing effect on democracy. The system of checks and balances ensures that no single branch dominates the others, and the separation of powers remains a fundamental aspect of the US government's structure.
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Congress and implied powers
The US Constitution grants Congress a specific set of powers known as "expressed" or "enumerated" powers, which form the basis of America's system of federalism. However, the framers of the Constitution also understood that they needed to provide some flexibility in the document for representatives to govern for the common good. This resulted in the inclusion of implied powers, which are powers that are not explicitly listed in the Constitution but are assumed to be necessary to implement the expressed powers.
Article I, Section 8, Clause 18 of the Constitution, also known as the "Necessary and Proper Clause" or the "Elastic Clause", 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 [...]
This clause provides Congress with the flexibility to address unforeseeable situations and issues that may arise over time. For example, Congress has the power to raise an army and navy, which implies the power to create an air force, even though the framers may not have envisioned humans fighting with airplanes and drones.
Another example of Congress's implied powers can be seen in its interpretation of the "Commerce Clause" (Article I, Section 8, Clause 3) to justify the passage of federal minimum wage laws. The "Commerce Clause" grants Congress the power to regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes. While gun control laws may seem to be at odds with the Second Amendment, Congress has cited its expressed power to regulate interstate commerce as justification for passing laws limiting the sale and possession of firearms.
The concept of implied powers has been a source of controversy and debate throughout American history. In McCulloch v. Maryland (1819), Chief Justice Marshall argued that Congress had the right to establish a national bank, as the Constitution grants Congress certain implied powers beyond those explicitly stated. However, this decision did not fully resolve the issue of national versus state power, and many political battles have been fought over constitutional interpretations of implied and residual powers.
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The Bill of Rights
The US Constitution is composed of the Preamble, seven articles, and 27 amendments. The first 10 amendments, proposed in 1789 and ratified in 1791, are known as the Bill of Rights. The Bill of Rights was added to the Constitution to limit government power and protect individual liberties.
The First Amendment prohibits the government from making laws that establish a religion or restrict the free exercise of religion, freedom of speech, freedom of the press, the right to assemble, and the right to petition the government.
The Second Amendment states that "a well-regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
The Third Amendment prohibits the quartering of soldiers in civilian homes without the owner's consent, except as prescribed by law during times of war.
The Fourth Amendment protects citizens' right to privacy and security in their persons, homes, papers, and property from unreasonable searches and seizures, requiring warrants to be issued only upon probable cause.
The Ninth Amendment states that the enumeration of certain rights in the Constitution shall not deny or disparage other rights retained by the people.
The Tenth Amendment reserves powers not delegated to the federal government by the Constitution to the states or the people.
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Amendments and their processes
The US Constitution is composed of the Preamble, seven articles, and 27 amendments, the first 10 of which are known as the Bill of Rights. The authority to amend the Constitution is derived from Article V of the Constitution. The process of amending the Constitution is very difficult and time-consuming. A proposed amendment must be passed by a two-thirds majority in both houses of Congress, and then ratified by three-quarters of the states (38 out of 50).
Once Congress proposes an amendment, the Archivist of the United States, who heads the National Archives and Records Administration (NARA), is responsible for administering the ratification process. The Archivist has delegated many of the duties associated with this function to the Director of the Federal Register. The Director examines ratification documents for legal sufficiency and an authenticating signature. If the documents are in order, the Director acknowledges receipt and maintains custody of them.
When the Director of the Federal Register verifies that the required number of authenticated ratification documents has been received, a formal proclamation is drafted for the Archivist to certify that the amendment is valid and has become part of the Constitution. This certification is published in the Federal Register and U.S. Statutes at Large, serving as official notice to Congress and the nation that the amendment process has been completed.
In addition to the formal amendment process, practices outside the letter of the Constitution based on custom and usage are often recognized as constitutional elements. These include the system of political parties, presidential nomination procedures, and the conduct of election campaigns. The actual operation of the electoral college system is also a convention.
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Frequently asked questions
The US Constitution outlines the frame of the federal government, dividing it into three branches: the legislative, consisting of the bicameral Congress (Article I); the executive, consisting of the president and subordinate officers (Article II); and the judicial, consisting of the Supreme Court and other federal courts (Article III).
Article IV deals with the relations between the states and privileges of the citizens of the states. One provision is the full faith and credit clause, which requires states to recognise the official acts and judicial proceedings of other states. Another provision is the guarantee of a republican form of government for each state.
All legislative powers are vested in the US Congress, which consists of a Senate and House of Representatives. Congress also possesses implied powers, such as the power to regulate commerce with foreign nations, and among the states.
The US Constitution outlines that no person shall be elected to the office of the President more than twice. While the formal powers of the President are constitutionally limited, historical and technological factors have increased the informal responsibilities of the office, such as proposing legislation to Congress.














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