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US Law vs UK Law

Where American Law Came From

The United States was founded on English law. The colonists were English subjects, and they claimed the rights of Englishmen. Four sources shaped the Declaration of Independence (1776) and the Constitution (1787):

  • Magna Carta (1215). It put the king under the law. It promised that no free man would be punished except by the lawful judgment of his peers or by the law of the land.

  • The English Bill of Rights (1689). It barred the Crown from taxing without Parliament's consent, protected the right to petition, and banned excessive bail and cruel and unusual punishments. The US Eighth Amendment uses nearly the same words.

  • The common law. This is law built from court decisions over centuries. Each decision guides later cases. US courts still use this method.

  • Blackstone's Commentaries on the Laws of England (1765 to 1769). This was the main law book in the colonies. The founders learned law from it.

The two countries started from the same roots. They then built very different systems. Knowing the differences helps you know your own rights.

Side-by-Side Comparison

1. The Constitution

US: One written document, the Constitution. It is the supreme law of the land.

UK: No single written constitution. The constitution is uncodified. It is made up of Acts of Parliament, court decisions, conventions (accepted practices) and historic documents such as Magna Carta.

2. Who Holds Power

US: Separation of powers. Congress makes the laws, the President carries them out, and the courts interpret them. Each branch checks the others.

UK: Parliamentary sovereignty. Parliament is the highest legal authority. The government (the Prime Minister and Cabinet) sits in Parliament and is accountable to it. The branches overlap more.

3. Head of State

US: The President is both head of state and head of government. The President is elected every four years and is limited to two terms.

UK: The monarch is head of state. The role is mostly ceremonial. The Prime Minister is head of government and is usually the leader of the largest party in the House of Commons.

4. How Laws Are Made

US: A bill must pass both the House of Representatives and the Senate. The President signs it or vetoes it. Congress can override a veto with a two-thirds vote in each house.

UK: A bill passes the House of Commons and the House of Lords, then receives Royal Assent from the monarch. The elected Commons can, under the Parliament Acts, pass most bills without the Lords' consent. Royal Assent has not been refused since 1708.

5. Courts and Judicial Review

US: The Supreme Court is the highest court. Since Marbury v. Madison (1803), courts can strike down laws that violate the Constitution.

UK: The UK Supreme Court opened in 2009. It took over the top court role from the House of Lords. It cannot strike down an Act of Parliament. It can review government actions, and under the Human Rights Act it can declare a law incompatible with human rights. Parliament then decides whether to change it.

6. Individual Rights

US: The Bill of Rights (the first ten amendments, 1791) protects speech, religion, the press, assembly, the right to bear arms, due process and more. Congress cannot pass a law that takes these rights away.

UK: The Human Rights Act 1998 brings the European Convention on Human Rights into UK law. It is an ordinary Act of Parliament, so Parliament can amend or repeal it.

7. Jury Trials

US: The Sixth Amendment guarantees a jury in criminal cases. The Seventh Amendment preserves it in many federal civil cases. Criminal verdicts must be unanimous.

UK: Juries hear serious criminal cases. Most criminal cases are heard by magistrates without a jury. Civil juries are rare. In England and Wales, a verdict can be by a majority of at least 10 of 12 jurors.

8. National and Local Government

US: Federal system. Power is shared between the national government and the 50 states. Each state has its own constitution, laws and courts.

UK: A unitary state with devolution. Parliament has given some powers to Scotland, Wales and Northern Ireland, and can take them back. There are three separate legal systems: England and Wales, Scotland, and Northern Ireland.

9. Changing the Constitution

US: Hard by design. An amendment needs two-thirds of both houses of Congress (or a convention called by two-thirds of the states), then ratification by three-fourths of the states. There have been 27 amendments.

UK: Parliament can change constitutional law by passing an ordinary Act. No special process is required.

What This Means for You

  • In the US, your rights are written in the Constitution. Read it. Know which amendment protects which right.

  • A US law that breaks the Constitution can be struck down in court.

  • In the UK, rights rest mainly on Acts of Parliament, and Parliament has the final word.

  • Both systems share Magna Carta's core idea: no one is above the law.

Where to Read the Originals

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