A cikin 1973, Masarautar Sikkim ta fuskanci tarzomar adawa da sarautu, wanda ke nuna mafarin gagarumin sauyi na siyasa.A shekara ta 1975, Firayim Minista na Sikkim ya yi kira ga Majalisar Indiya don Sikkim ta zama jiha a cikin Indiya.A watan Afrilun 1975, sojojin Indiya sun shiga Gangtok, babban birnin kasar, kuma suka kwance damarar masu gadin fadar Chogyal, sarkin Sikkim.Wannan kasancewar sojan ya yi fice, inda rahotanni ke nuni da cewa Indiya ta jibge dakaru tsakanin 20,000 zuwa 40,000 a kasar mai mutane 200,000 kawai a lokacin zaben raba gardama.Kuri'ar jin ra'ayin jama'a da ta biyo baya ta nuna goyon bayanta ga kawo karshen mulkin kama karya da shiga Indiya, inda kashi 97.5 na masu kada kuri'a suka amince.A ranar 16 ga Mayu, 1975, Sikkim a hukumance ya zama jiha ta 22 na Tarayyar Indiya, kuma an soke daular.Don sauƙaƙe wannan haɗin gwiwa, Tsarin Mulkin Indiya ya sami gyare-gyare.Da farko, an zartar da gyare-gyare na 35, wanda ya sa Sikkim ya zama "jahar tarayya" ta Indiya, matsayi na musamman da ba a ba wa kowace jiha ba.Duk da haka, a cikin wata guda, an kafa 36th Amendment, wanda ya soke gyaran 35th kuma ya haɗa Sikkim gaba daya a matsayin jihar Indiya, tare da sunansa a cikin Jadawalin Farko na Kundin Tsarin Mulki.Waɗannan abubuwan sun nuna gagarumin sauyi a matsayin Sikkim na siyasa, daga masarauta zuwa wata jiha a cikin Tarayyar Indiya.