Indira Gandhi
14 events, 1964 to 1980; 4 marked as turning points.
1964
Kamaraj becomes Congress president and 'kingmaker'
As president of the Indian National Congress, K. Kamaraj guided the selection of two Prime Ministers.

1968
Official Languages (Amendment) Act guarantees bilingualism
Amid fresh protests in Madras State, Parliament amended the 1963 Act to ensure English would continue in use alongside Hindi.
1971
DMK wins 184 seats in the 1971 election
The DMK, allied with Indira Gandhi's Congress, won a landslide in the first Assembly election held under the name Tamil Nadu.

1974
Sirima-Gandhi Pact on stateless persons of Indian origin
India and Sri Lanka agreed on the future of the 150,000 persons of Indian origin whose status had been left open by the 1964 Sirima-Shastri Pact.

Assembly adopts state autonomy resolution
Chief Minister Karunanidhi moved a resolution in the Assembly demanding state autonomy, based on the Rajamannar Committee's recommendations.

India recognises Sri Lankan sovereignty over Katchatheevu
Under the Indo-Sri Lankan Maritime Agreement, India accepted Katchatheevu island in the Palk Strait as Sri Lankan territory.

Chief Ministers win right to hoist flag on Independence Day
Following Karunanidhi's demand, Chief Ministers won the right to hoist the national flag on Independence Day, and he did so at Fort St. George.

1975
Indira Gandhi's government declared a national Emergency; the DMK government in Tamil Nadu opposed it.

1976
Kamaraj awarded the Bharat Ratna posthumously
Former Chief Minister K. Kamaraj, who died in October 1975, was posthumously awarded the Bharat Ratna.

India and Sri Lanka sign the 1976 maritime agreement
A further agreement on the maritime boundary restricted fishermen of each country from fishing in the other's exclusive economic zone.

Karunanidhi government dismissed; President's rule imposed
During the Emergency the Union government dismissed the DMK ministry and imposed President's rule in Tamil Nadu.

1977
Congress-AIADMK alliance wins 34 Lok Sabha seats in Tamil Nadu
In the post-Emergency Lok Sabha election, the Congress-AIADMK-CPI alliance won 34 of Tamil Nadu's 39 seats even as the Janata Party took power nationally.
1980
DMK-Congress alliance wins 37 of 39 Lok Sabha seats
The Congress (Indira) and DMK alliance won 37 of Tamil Nadu's 39 Lok Sabha seats, a setback for M. G. Ramachandran's ruling AIADMK.
MGR government dismissed, President's rule imposed
The Union government dismissed the AIADMK ministry and dissolved the Tamil Nadu assembly, imposing President's rule.