Regional aspirations

Read the passage and answer the questions below:
One of Hazarika’s songs.. … dwells on the unity theme; the seven
states of north-eastern India become seven sisters born of the same
mother. …. ‘Meghalaya went own way…., Arunachal too separated and Mizoram appeared in Assam’s gateway as a groom to marry
another daughter.’ ….. …. .. The song ends with a determination to
keep the unity of the Assamese with other smaller nationalities that are
left in the present-day Assam – ‘the Karbis and the Missing brothers
and sisters are our dear ones.’ — Sඉඖඒඑඊ Bඉකඝඉඐ
(a) Which unity is the poet talking about?
(b) Why were some States of North-East created separately out of
the erstwhile State of Assam?
(c) Do you think that the same theme of unity could apply to all the
regions of India? Why?