The correct answer is The British North-American Act.
Key Points
- The concept of "A Union of States in the Indian Constitution" has been derived from The British North-American Act.
- Federation with a strong Centre is what we call A Union of States in the Indian Constitution hence it is taken from the Canadian constitution i.e The British North-American Act.
Additional Information
- Concept of Concurrent list, Article 108, Joint sitting of the two houses and Freedom of trade and commerce is taken from Australian Constitution.
- Impeachment of the president, Functions of president and vice-president, Removal of Supreme Court and High court judges, Fundamental Rights, Judicial review, Independence of the judiciary, and the Preamble of the constitution of the Indian constitution is taken from the constitution of the USA.
- Centrifugal form of federalism where the center is stronger than the states, Residuary powers vest with the center, Centre appoints the Governors at the states, Advisory jurisdiction of the supreme court of the constitution of the Indian constitution is taken from the constitution of Canada.
- Fundamental duties and ideals of justice (social, economic, and political), expressed in the Preamble are taken from the constitution of Russia.
- Concepts of Republic and Ideals of Liberty, Equality, and Fraternity (contained in the Preamble) are taken from the constitution of France.
- Fundamental Rights are suspended during Emergencies are taken from the constitution of Germany.
- The election of members of the Rajya Sabha and the Amendment of the Constitution is taken from the constitution of South Africa.
- The concept of procedure established by Law is taken from the constitution of Japan.

