Which country has the world's oldest and unwritten constitution?

The correct answer is Britain.

Key Points

• Britain has the world's oldest and unwritten constitution.
• The Magna Carta, which King John of England issued in 1215, serves as the fundamental charter or constitution for the modern-day United Kingdom. 
• Since then, in reaction to social, political, and economic developments, the constitution of the United Kingdom has naturally changed throughout time.
• The current constitution includes numerous customs or unwritten norms of constitutional practice in addition to historic laws like the 1689 Bill of Rights. 
• These unwritten but yet binding customs continue to dominate the relationship between the monarch and Parliament as well as the residual (prerogative) rights of the king.
• The constitution of Britain is a evolving constitution which is ever evolving and always changing hence it is based on customs and value and not on written principles.

Additional Information

• The constitution of USA
  • The United States of America adopted a democratic constitution in 1787.
  • Constitution of America came into force in 1789.
  • 'We the People' are the first three words of the American constitution.
  • American constitution has been amended 27 times.
  • The first ten amendments are collectively known as the Bill of Rights.
• The constitution of France
  • French constitution created by the National Assembly during the French Revolution in 1791.
  • The French Constitution is the only democratic Constitution based on the principle of the Supremacy of the Executive.
  • The Parliament of France does not have the supreme power about formulating laws.
  • The legislature can only make laws based on a list, while the President takes care of every other matter.