"The impetus for violent conflict between the Tamil minority and the Sinhalese majority began when the British Colonialists favored the Tamils for administrative, educational, and economic control of Sri Lanka due to their policy of divide and conquer. With the 1956 Sinhala Only Act which initially restricted the fair use of Tamil and English languages. Protests against this policy by the Tamils was met with mob violence that eventually snowballed into the 1958 riots."
This seems pretty similar to how Britishers gave jobs to Brahmins only and as a result created everlasting hatred among Hindus. Guess India is lucky to have Gandhi else there would have been genocide of many tribes,clans,ethnic people in India.