Since you will not be inclined to go through hundreds of pages of data in the Human Development Report, Assam, i am affixing a news link for your quick perusal.
https://swarajyamag.com/amp/story/politics/the-fierce-battle-over-modi-in-muslim-majority-dhubri
(Pasting the relevant parts, you can go through it in entirety if you so wish)
Zahirul Islam is widely-respected and is an indigenous Muslim of the state (known as
Ujani Muslim or
Khilonjia Muslim).
Badruddin Ajmal, on the other hand, is a Bhatia Muslim (as those of Bangladeshi-origin are called). While Ajmal, with his Islamic beard, long kurtas and short pyjamas, represents the conservative face of Islam, Zaved Islam is seen as a liberal, like his father.
Dhubri, the western-most district of Assam that borders Bangladesh to its south-west, is an overwhelmingly Muslim-majority district. At the turn of the last century, Dhubri was a Hindu-majority area...
Thus, the region’s demography started changing. According to old records, 80 per cent of the population in Dhubri town were Hindus in the early 1920s. By 1951, 40 per cent of the town’s population were Muslims and 60 per cent of the population of the area that forms the present-day Dhubri district were Muslims. As per the 2011 census, Muslims form 80 per cent of the population of the district.
The British policy of settling landless Muslim peasants from East Bengal (
mainly from Rangpur and Mymensingh) in Dhubri triggered mass exodus of more land-hungry and impoverished Muslims into Assam, especially the lower Assam districts bordering Bangladesh. And thus, the demography of Dhubri changed permanently.
This entry of Muslims into Assam continued even after Independence with successive Congress regimes in the state encouraging this illegal influx for the purpose of creating vote banks. These infiltrators were provided political patronage and given citizenship documents and land pattas. In return, they voted for the Congress and kept that party in power for a long time.
Profile Of The Electorate
Of the 18,40,044 voters of Dhubri Lok Sabha constituency, 77 per cent are Muslims.
Of them, nearly 70 per cent are Bhatias (of relatively recent Bangladeshi origin) and the rest are Ujanis or Khilonjias (indigenous Muslims). The Khilonjias speak Assamese and Goalparia (the dialect of Goalpara which is a mix of Bengali, Rajbongshi and Assamese) while the Bhatias speak the Bengali dialect of the provinces in East Bengal (present-day Bangladesh) where they hailed from.
