Tilak’s Congress faction drove social reform out and won the battle.

Evidence

Under the leadership of the late Mr Tilak, the courtesy with which the Congress allowed the Social Conference the use of its pandal was withdrawn, and the spirit of enmity went to such a pitch that when the Social Conference desired to erect its own pandal, a threat to burn the pandal was held out by its opponents. Thus in the course of time the party in favour of political reform won, and the Social Conference vanished and was forgotten. — Ambedkar, B R, Annihilation of Caste_ The Annotated…, 817

Categorization

• XREF: A key causal link for the reader’s thesis: this explains why the Congress abandoned caste annihilation for political self-rule — the exact historical bifurcation Ambedkar indicts.