Parliament
27 events, 1853 to 2025; 3 marked as turning points.
1853
Madras Native Association petition read in the House of Lords
The Earl of Ellenborough read the Madras Native Association's catalogue of grievances in the House of Lords.
1951
First Amendment enables reservation for backward classes
Parliament passed the First Amendment, allowing special provisions for socially and educationally backward classes.

1962
Annadurai demands self-determination in the Rajya Sabha
In his Rajya Sabha speeches, C. N. Annadurai stated the DMK case for the right of self-determination for the Dravidian south.

1963
Parliament passed the Official Languages Act to allow continued use of English alongside Hindi after 1965.
Death of Muthuramalinga Thevar
Forward Bloc leader U. Muthuramalinga Thevar, an influential figure in southern Tamil Nadu, died on the eve of his birthday.

DMK drops demand for a separate Dravida Nadu
After the Sino-Indian War and the anti-secession Sixteenth Amendment, the DMK abandoned its demand for an independent Dravida Nadu.

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.
1969
Madras State renamed Tamil Nadu
With the Madras State (Alteration of Name) Act, 1968 in force, the state officially took the name Tamil Nadu.

1973
AIADMK wins the Dindigul Lok Sabha by-election
K. Maya Thevar won the Dindigul by-election, giving the newly formed AIADMK its first electoral victory.

1974
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.

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.
1986
Tamil Nadu Legislative Council abolished
The upper house of the Tamil Nadu legislature, in existence since 1921, was abolished at the request of the MGR government.
1989
Congress-AIADMK alliance wins 38 of 39 Lok Sabha seats
Months after losing the state election, the reunited AIADMK and its ally the Congress won 38 of Tamil Nadu's 39 Lok Sabha seats.
1991
Congress-AIADMK alliance sweeps all 39 Lok Sabha seats
In the election during which Rajiv Gandhi was assassinated at Sriperumbudur, the Congress-AIADMK alliance won all 39 Lok Sabha seats in Tamil Nadu.
1996
DMK-TMC alliance wins 1996 election
The DMK-TMC alliance won 221 of 234 assembly seats and all 39 Lok Sabha seats; M. Karunanidhi became Chief Minister for the fourth time.

1997
Jain Commission interim report on the Rajiv Gandhi assassination
Criticism of the DMK over the LTTE in the Jain Commission's interim report prompted Congress to demand the party's exit, bringing down the Gujral government.
1998
AIADMK allies with the BJP; NDA wins 30 seats in Tamil Nadu
Breaking its long alliance with the Congress, the AIADMK joined the BJP-led front, which won 30 of Tamil Nadu's 39 Lok Sabha seats.
1999
AIADMK withdraws support, Vajpayee government falls
The AIADMK's withdrawal of support led to the Vajpayee government losing a confidence vote by a single vote.
DMK allies with the BJP; NDA wins 26 seats in Tamil Nadu
With the AIADMK out of the NDA, the DMK allied with the BJP for the first time and the NDA won 26 of Tamil Nadu's 39 Lok Sabha seats.
2002
A. P. J. Abdul Kalam becomes President of India
Rameswaram-born scientist A. P. J. Abdul Kalam, backed by both the BJP and the Congress, took office as the 11th President of India.

2004
DMK-led alliance wins all 39 Lok Sabha seats
The DMK-led Democratic Progressive Alliance with the Congress and Left won every Lok Sabha seat in Tamil Nadu and Puducherry; the AIADMK-BJP alliance won none.
2009
DMK-Congress alliance wins 27 of 39 Lok Sabha seats
Against expectations, the DMK, Congress and VCK won 27 of Tamil Nadu's 39 Lok Sabha seats, helping the UPA return to power.
2011
Former Telecom Minister A. Raja and later Kanimozhi were arrested in the 2G spectrum case; a special court acquitted all accused in 2017.

2019
DMK alliance sweeps 2019 Lok Sabha election in Tamil Nadu
The DMK-led Secular Progressive Alliance won 38 of the 39 Lok Sabha seats in Tamil Nadu.
2024
DMK alliance wins all 39 Lok Sabha seats
The DMK-led INDIA bloc won all 39 Lok Sabha seats in Tamil Nadu; the AIADMK and BJP, contesting separately, won none.
2025
Joint Action Committee on fair delimitation meets in Chennai
Chief Ministers and leaders from several states met in Chennai at Stalin's call to oppose delimitation based only on population.