In 1972, a new Constitution was proclaimed by the Sinhala majority who constituted themselves a Constituent Assembly, sat in premises outside Parliament to reinforce the constitutional break with the past, gave themselves an auththochnous Constitution, which changed the name of the island from Ceylon to the Sinhala, Sri Lanka, proclaimed Buddhism as the state religion and removed even the meager safeguards against discrimination contained in the earlier Constitution. The plea of the Tamil parliamentary parties for a federal constitution was rejected and the leader of the Tamil parliamentary group resigned his seat in Parliament and sought a mandate from the Tamil people for a separate state. On winning the bye election; Therer was declared by Mr.Chelvanayakam that “Tamil Eelam nation should exercise the sovereignty already vested in the Tamil people and become free”
It was a mandate which was later crystallized in the Vaddukoddai Resolution of 1976, and in the 1977 Election Manifesto of the Tamil parliamentary parties and was overwhelmingly endorsed by the Tamil people at the General Election in July 1977. The response of the Sinhala people to this parliamentary struggle was yet another physical attack on Tamils to intimidate them into submission.