Which state was a ‘protectorate’ of India at the time of independence?

NCERT (2026-27): “Sikkim’s merger … At the time of independence, Sikkim was a ‘protectorate’ of India. It meant that while it was not a part of India, it was also not a fully sovereign country. Sikkim’s defence and foreign relations were looked after by India, while the power of internal administration was with the Chogyal, Sikkim’s monarch. This arrangement ran into difficulty as the Chogyal was unable to deal with the democratic aspirations of the people. An overwhelming majority of Sikkim’s population was Nepali. But the Chogyal was seen as perpetuating the rule of a small elite from the minority Lepcha-Bhutia community.…”