Step 1: Understanding the Concept:
This question is referring to the National Emergency declared in India in the mid-1970s, a highly significant and controversial period in India's political history.
Step 2: Detailed Explanation:
The state of national emergency was proclaimed on the night of June 25, 1975. The official proclamation was made by the then President of India, Fakhruddin Ali Ahmed. However, the President made this declaration on the advice of the Prime Minister, Indira Gandhi, and her government. The government cited "internal disturbances" as the reason for the emergency, invoking Article 352 of the Indian Constitution. The Emergency lasted for 21 months and was lifted on March 21, 1977.
Step 3: Final Answer:
The emergency was declared on June 25, 1975, by President Fakhruddin Ali Ahmed, on the advice of Prime Minister Indira Gandhi.