Important constitutional borrowings:
• USA $\rightarrow$ Federal System, Fundamental Rights, Judicial Review.
• UK $\rightarrow$ Parliamentary System, Rule of Law.
• Ireland $\rightarrow$ Directive Principles of State Policy.
• Russia (USSR) $\rightarrow$ Fundamental Duties.
Concept:
India follows a federal system with a strong Centre. This dual polity consists of two levels of government:
• Union (Central) Government
• State Governments
This feature is borrowed from the Constitution of the United States of America.
Step 1: Understand dual polity.
Dual polity means that powers are divided between the Central Government and the State Governments.
Step 2: Analyse the options.
• Irish Constitution -- Source of Directive Principles of State Policy.
• Russian Constitution -- Source of Fundamental Duties.
• American Constitution -- Source of the federal system (dual polity). \checkmark
• English Constitution -- Source of Parliamentary Government and Rule of Law.
Step 3: Final conclusion.
Hence, the Indian dual polity resembles the
\[
\boxed{\text{American Constitution}.}
\]