How did the government policy of Sri Lanka affect the interest of the minority?

Sri Lanka is an island nation, south of India. It got independence in 1948. It has a diverse population like most of the South Asian nations.

The population in the majority is Sinhala speakers, with about 74% and rest are Tamil Speakers.

When Sri Lanka recognized Sinhala as the only official language, it disregarded Tamils. They felt that they were denied equality. As a result, the relationship between the Sinhala and the Tamils strained and the Sri Lankan Tamils launched movements against the government.