<P> Prime Minister Dorji appealed to the Indian Parliament for representation and change of status to statehood . On 14 April 1975 , a referendum was held , in which Sikkim voted to merge with the union of India . Sikkim became the 22nd Indian State on 26 April 1975 . On 16 May 1975 , Sikkim officially became a state of the Indian Union and Lhendup Dorji became head of State ( chief minister ) . </P>
<P> Prime Minister Dorji appealed to the Indian Parliament for representation and change of status to statehood . On 14 April 1975 , a referendum was held , in which Sikkim voted to merge with the union of India . Sikkim became the 22nd Indian State on 26 April 1975 . On 16 May 1975 , Sikkim officially became a state of the Indian Union and Lhendup Dorji became head of State ( chief minister ) . </P>
how sikkim became a part of indian union
how sikkim became a part of indian union
a referendum was held
a referendum was held