The decade between 1967 and 1977 represents one of the most transformative phases in Tamil Nadu’s electoral and political history. This period witnessed the end of long-standing Congress dominance, the rise and consolidation of Dravidian parties, internal political splits, and the emergence of new leadership that reshaped the state’s political landscape.

The 1967 Tamil Nadu Assembly election marked a watershed moment in the state’s political history. The Dravida Munnetra Kazhagam led by C. N. Annadurai defeated the Indian National Congress, which had ruled the state since independence. The victory was driven by several factors including rising regional identity, dissatisfaction with the Congress government, and the strong impact of the anti-Hindi agitations of 1965.

Annadurai became Chief Minister in 1967 and introduced several landmark reforms. One of his most significant decisions was officially renaming Madras State as Tamil Nadu in 1969, reflecting the cultural and linguistic identity of the Tamil people. His government also implemented subsidised rice schemes and promoted the two-language policy (Tamil and English) in education and administration. These measures strengthened the Dravidian ideology of social justice, regional pride, and linguistic equality.

Annadurai’s tenure was cut short due to illness, and he passed away in February 1969. After his death, senior DMK leader M. Karunanidhi assumed office as Chief Minister. Karunanidhi continued the policies of the DMK government and focused on infrastructure development, education, and promotion of Tamil culture.

Under his leadership, the DMK government expanded welfare programmes and improved transport and public works infrastructure. Karunanidhi also encouraged the growth of the Tamil film industry and literature, which played a crucial role in shaping public opinion and political messaging during this period.

The next major electoral milestone came in the 1971 Tamil Nadu Assembly election. The DMK, led by Karunanidhi, formed an alliance with the Indian National Congress faction headed by Indira Gandhi. The alliance secured a decisive victory, allowing the DMK to retain power comfortably.

The 1971 victory strengthened the DMK’s position and confirmed the decline of the Congress as the dominant political force in Tamil Nadu. During this period, the state government continued to focus on social justice policies, reservation for backward communities, and economic development.

The political scenario changed dramatically in 1972 when popular film star and DMK leader M. G. Ramachandran split from the DMK after differences with Karunanidhi. MGR founded the All India Anna Dravida Munnetra Kazhagam(AIADMK), naming it after Annadurai.

MGR’s immense popularity among the public quickly turned the AIADMK into a powerful political force. His image as a champion of the poor, reinforced through his films, attracted large numbers of supporters, particularly among rural and working-class voters.

A major turning point came during the national political crisis known as the The Emergency in India (1975–1977)declared by Prime Minister Indira Gandhi. During this period, political opposition across India was suppressed and several state governments were dismissed.

In 1976, the DMK government in Tamil Nadu was dismissed by the central government on allegations of corruption and anti-national activities. The state was placed under President’s Rule, bringing an abrupt end to Karunanidhi’s administration.

By the end of this decade, Tamil Nadu politics had undergone major changes. The Congress party had lost its dominant position, while the two Dravidian parties—DMK and AIADMK—emerged as the primary political forces in the state.

The developments of this decade laid the foundation for a fierce and enduring political rivalry between Dravida Munnetra Kazhagam and All India Anna Dravida Munnetra Kazhagam. With charismatic leaders like M. Karunanidhi and M. G. Ramachandran commanding strong public support, Tamil Nadu politics entered a new phase characterized by personality-driven campaigns, welfare-oriented governance, and intense electoral competition. This rivalry would dominate the state’s political narrative in the years that followed.

The period between 1967 and 1977 therefore represents the consolidation of Dravidian political ideology and the beginning of a new electoral rivalry that would dominate Tamil Nadu politics for decades to come.