Examine the diverse geopolitical mechanisms utilized to finalize India's territorial boundaries:
1. The enclaves of Daman and Diu were forcefully assimilated from Portuguese control via a targeted police action.
2. The Himalayan kingdom of Sikkim became a constituent unit following a democratic referendum that abolished its monarchy.
3. The administration governed Puducherry strictly as an 'acquired territory' until its formal conversion into a union territory in 1962.