How did the feeling of alienation develop among the Sri Lankan Tamils

How did the feeling of alienation develop among the Sri Lankan Tamils?

Sri Lanka has a diverse population. The major social groups are the Sinhala-speakers (74 per cent) and the Tamil-speakers (18 per cent).

The leaders of the Sinhala Community sought to secure dominance over government by virtue of their majority
Sinhala became the only official language
Sinhala applicants were preferred in university position and government jobs
Buddhism was made state religion through a new constitution