Step 1: Understanding the Question:
The question asks to identify the specific article of the Indian Constitution that describes India as a 'union of states'.
Step 2: Key Concept:
The very first article of the Constitution defines the name and territory of the country.
Step 3: Detailed Explanation:
Article 1 of the Constitution of India states:
(1) India, that is Bharat, shall be a Union of States.
(2) The States and the territories thereof shall be as specified in the First Schedule.
Dr. B. R. Ambedkar explained that the phrase 'Union of States' was preferred over 'Federation of States' to indicate two things: first, the Indian federation is not the result of an agreement among the states like the American federation, and second, the states have no right to secede from the federation. The Union is indestructible.
Step 4: Final Answer
Article 1 of the Constitution declares that India, that is Bharat, shall be a Union of States.