Madras State was officially renamed as Tamil Nadu on 14 January 1969 during the tenure of Chief Minister C.N. Annadurai. The renaming reflected Tamil identity and linguistic reorganisation trends in India. This followed the broader movement of linguistic states after the States Reorganisation Act, 1956. Other dates are incorrect.

Sikkim became the 22nd state of India in 1975 through the 36th Constitutional Amendment Act. Prior to this, it was an associate state under the 35th Amendment. The transition followed a referendum where people voted for integration with India. This marked completion of India’s territorial consolidation. Other dates are incorrect.

Article 1 declares India as a “Union of States” and defines its territory. It includes states, union territories, and acquired territories. Articles 2 and 3 deal with admission and reorganisation of states. This provision establishes India’s territorial identity.