A good example of a country with a largely unwritten constitution is

Step 1: Analyze the question The question asks which country is best known for a largely unwritten constitution.

Step 2: Explain the concept

• A written constitution is codified in a single, formal document (e.g. the US Constitution of 1787, Nigeria's 1999 Constitution).
• An unwritten constitution is not contained in one document. It is made up of statutes, common law, judicial decisions, conventions, and customs built up over centuries. It is also called an uncodified constitution.

Step 3: Check each option

• A. United States of America: It has a written constitution (1787), the oldest written national constitution still in use. ❌
• B. Soviet Union: It had written constitutions (1918, 1924, 1936, 1977). ❌
• C. Nigeria: It has a written constitution (the 1999 Constitution, as amended). ❌
• D. United Kingdom: Its constitution is not in one document. It draws on the Magna Carta (1215), the Bill of Rights (1689), Acts of Parliament, common law, and conventions such as the PM being the leader of the majority party in the House of Commons. ✅

Step 4: Answer The United Kingdom is the classic example of a country with a largely unwritten (uncodified) constitution.

Exam tip: Remember "UK = Unwritten Kingdom". Britain, along with New Zealand and Israel, is one of the few countries without a single codified constitution. Also note that the UK's constitution is flexible (it can be changed by an ordinary Act of Parliament), while written ones like Nigeria's and America's are usually rigid. JAMB often tests this link.