Are all Tamils Dalits and are all sinhala considered Brahmins?

 This answer is specific to the original questioner “Helmand Silva”

On his question:

Are all Tamils Dalits and are all sinhala considered Brahmins?

Let us understand the history,

1. The Varna System of “Brahmins and Sudras ( Dalits?)” is applicable to region North of Vindhyas and South of Himalayas earlier. (The terms Originated from an erstwhile country called “Aryavardha” in North West Corner of the sub continent)
2. During 3rd Century, the Hinduism (Saktheism) focused more on rituals including animal and human sacrifices.
3. This lead to the revolt against the Brahmins in North by Sudras( Dalits?). Sudras executed Brahmins who performed these rituals.
4. The revolt spread to Maharashtra, and revolters from North reached Kanchi, Chozha, Pandiyan countries before reaching the Island nation.(Note the size of Island nation is about few polypats of that of Pandya Kingdom)
5. Sudra (Dalit)Revolters from Avadh, Magadh, Maharashtra Sata Vahanas, Kalingas toppled Governments in South as well by captivating the Princes, putting them in jail. New rulers stopped endowment to Temples and their monks ensured “no such bali rituals” watching from nearby hillock beds.
6. The revolters are called “Kalabhras” (Kalappirayars in Tamil) and locals had no clue from where they came and what language they spoke.
7. The period between 3rd and 7th century is called “Darkest Period” and all lieterary work came standstill, they imposed Shramanic religions on locals.
8. Bhakti Movement of 64 Nayanmars and 12 Azhwars from 7th to 9th century saw the revival of Shaivism and Vaishnavism and uprooted the Shramanic religions from TN.
9. The Island nation is untouched during Bhakti Movements till 12th century and Sudras of North India mingled with locals of Island Nation and their descendants practice Shramanic religions.
10. During 15th century, there was an effort to convert Buddhist countries in South East Asia to Kaumaram (Murugan Worship) by a mystic Arunagiri Nathar Patronised by Vijayanagara Emperor Prauda Devaraya II. His commander Lakkanna defeated Ceylon and installed a small polygar at Kandy which paved the formation of Kota Dynasty at Kandy.
11. During 16th Century, (after Talikata War 1547) Kandy stopped paying tribute to Vijayanagara Empire. Kumara Krisnappa Naicker of Madurai captured Kandy again, changed the reigns to Sithawakas and rebuilt Kataragama Temple. This time he made Gopala Naidu, his brother in law as Viceroy to oversee the tributes are paid in time to accept sovereignity. But successive rulers of Madurai, Tanjavur and Chenji are secular and focused on trade. They had marital alliance and supported the Kandy kingdom till 1815.
12. Yes. If we apply North Indian Varna profession based Classification System (Is it relevant in today's era?) Sinhalese are descendants of Sudras (Dalits?) from Magadh to Kalinga regions who embraced Shramanic religions.
13. and
14. Island Tamils follow the caste system of Mainland Tamils.
15. Either putting a scale of Varnas or Caste system is condemnable in today's digital era where anyone take any profession.

Religion is Politics; Whereas Spirituality is Not.