
The US Constitution is the oldest written national constitution that is still in use. It was written in 1787 and is the fundamental law of the US federal system of government. The Constitution has three main functions: it creates a national government consisting of a legislative, an executive, and a judicial branch, with a system of checks and balances among the three branches; it divides power between the federal government and the states; and it protects various individual liberties of American citizens. The Constitution was a product of political compromise after long and often rancorous debates over issues such as states’ rights, representation, and slavery.
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What You'll Learn

To unite a group of states with different interests, laws and cultures
The US Constitution was established to unite a group of states with different interests, laws, and cultures under a national government. This was a significant departure from the Articles of Confederation, the nation's first constitution, which allowed states to act together only for specific purposes.
The Constitution's preamble states the intention to ""form a more perfect Union," indicating the founding fathers' desire to create a unified nation from the previously disparate states. This union was intended to vest the power of governance in the people, ensuring that citizens were united as members of a whole.
The Constitution's framework, with its division of powers and system of checks and balances, was designed to accommodate the diverse interests and cultures of the states. It established a federal government with three branches: the legislative, consisting of the bicameral Congress; the executive, consisting of the President and subordinate officers; and the judicial, consisting of the Supreme Court and other federal courts. This structure allowed for a balance of power between the federal government and the individual states, ensuring that no single branch or state dominated the others.
The Constitution also provided protections for individual liberties, prohibiting states from discriminating against citizens of other states and safeguarding citizens' rights from intrusions by the government. These protections were included to respect the different interests and cultures of the states and to prevent the tyranny of a single authority, a reaction to the monarchical rule previously experienced under the British.
By uniting the states and creating a unified national government, the US Constitution ensured the survival and effectiveness of the American experiment in democracy, allowing it to endure and thrive in a world vastly different from its founding era.
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To establish a national government
The US Constitution establishes a national government, uniting a group of states with different interests, laws, and cultures. It creates a federal government with fundamental laws and rights guaranteed to American citizens. The Constitution also establishes the relationship between the states and the federal government, ensuring that states maintain a high degree of independence while remaining subordinate to a central governing body.
The Constitution divides power between the federal government and the states, with the federal government consisting of three branches: the legislative, the executive, and the judicial. The legislative power is vested in Congress, which consists of the House of Representatives and the Senate. The executive power is invested in the President, who can veto laws passed by Congress. The judicial power is vested in the Supreme Court and other federal courts created by Congress.
The Constitution provides a system of checks and balances designed to prevent the tyranny of any one branch. Most important actions require the participation of more than one branch of government. For example, while Congress passes laws, the President can veto them. The federal courts also have the power to declare a statute enacted by Congress as unconstitutional and therefore invalid.
The Constitution's framework was a reaction to the tyranny of British rule and the limitations placed by this form of government. The Articles of Confederation, the first national government, were weak and incapable of forging the original thirteen states into one nation. The Constitution, therefore, acted as a correction to this, uniting citizens as members of a whole.
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To protect the personal liberty of citizens from government intrusion
One of the primary purposes of the US Constitution is to protect the personal liberty of citizens from government intrusion. The Constitution was written in the summer of 1787 in Philadelphia, Pennsylvania, by delegates from 12 states, to replace the Articles of Confederation with a new form of government. It created a federal system with a national government composed of three separated powers: the executive, legislative, and judicial branches.
The Constitution's framework was influenced by the history of British tyranny and the limitations placed on the federal government and its branches were a reaction to this. The Constitution also divides power between the federal government and the states. The privileges and immunities clause in Article IV, Section 2, provides that "The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens of several states." This limits the ability of states to discriminate against out-of-state citizens regarding specific fundamental rights.
The first ten amendments to the Constitution make up the Bill of Rights, which provides further protections for individual liberties. James Madison wrote these amendments to limit government power. The Bill of Rights was added because the Constitution lacked limits on government power. The Fourth Amendment, for example, safeguards citizens' right to be free from unreasonable government intrusion in their homes by requiring a warrant. The First Amendment also protects citizens' right to speak and worship freely, prohibiting Congress from making laws establishing religion or abriding freedom of speech.
The federal courts have the power to declare a statute enacted by Congress as unconstitutional, a power established in the landmark case of Marbury v. Madison in 1803. This power of judicial review acts as a further check on government power. The Supreme Court, however, does not have unlimited power, and its judgments are dependent on the cooperation of the executive branch.
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To divide power between the federal government and the states
One of the primary purposes of the US Constitution was to divide power between the federal government and the states. The Constitution establishes the relationship between the states and the federal government, ensuring that states maintain a high degree of independence while still being subordinate to a larger governing body.
The Constitution divides power by creating a national government consisting of a legislative, an executive, and a judicial branch, with a system of checks and balances among the three branches. This system is designed to avoid the tyranny of any one branch and to protect against intrusions on personal liberty by the government. The legislative power is given to Congress, which consists of the House of Representatives and the Senate. The executive power is invested in the President, who can veto laws passed by Congress. The judicial power is vested in the Supreme Court and other federal courts created by Congress.
The Constitution also provides for the division of power between the states and the federal government in specific areas. For example, the Constitution gives Congress the power to regulate interstate commerce, limiting the ability of states to do so. The Constitution also prohibits states from discriminating against citizens of other states and sets out the process for amending the Constitution, which requires the ratification of three-fourths of the states.
The division of power between the federal government and the states was a reaction to the tyranny of British rule and the limitations of the Articles of Confederation, the previous system of government. The Articles of Confederation had created a weak government that was unable to effectively unite the states into one nation. The Constitution sought to correct this by creating a stronger federal government while still preserving the independence of the states.
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To create a system of checks and balances
The US Constitution outlines three branches of government: the legislative, the executive, and the judiciary. Each branch has specific powers and responsibilities, and they work together to govern the country.
The Constitution establishes a system of checks and balances to ensure that no one branch becomes too powerful. This system allows each branch to limit or "check" the powers of the others, creating a balance of power.
For example, while Congress creates laws, the President can veto them. The President also nominates heads of federal agencies and high court appointees, but these nominations must be confirmed by the Senate. In turn, Congress can remove the President from office in exceptional circumstances.
The Supreme Court, meanwhile, can declare laws or statutes enacted by Congress to be in violation of the Constitution and therefore invalid. This power of judicial review was established in the landmark case of Marbury v. Madison in 1803. The Court's justices, nominated by the President and confirmed by the Senate, can overturn laws deemed unconstitutional.
This system of checks and balances is a key feature of the US Constitution, designed to prevent tyranny and protect individual liberties. It was a reaction to the tyranny experienced under British rule, specifically the power held by a single monarch. The Constitution's framers were influenced by political theorist Baron Charles de Montesquieu, who wrote about the separation of powers almost 100 years earlier.
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Frequently asked questions
The US Constitution is the fundamental law of the US federal system of government. It defines the basic rights of citizens and the principal organs of government and their jurisdictions.
The first function of the US Constitution is to create a national government consisting of a legislative, an executive, and a judicial branch, with a system of checks and balances among the three branches. The second function is to divide power between the federal government and the states. The third function is to protect various individual liberties of American citizens.
The US Constitution protects the personal liberty of citizens from intrusions by the government. For example, Article I, Sections 9 and 10 prohibit ex post facto laws, which punish conduct that was not illegal at the time, and bills of attainder, which single out individuals or groups for punishment.

























