“Bengali or Bangla (বাংলা) is the language native to the region of Bengal, which comprises of the present-day nation of Bangladesh and of the Indian states West Bengal, Tripura and southern Assam. With about 220 million native and about 250 million total speakers, Bengali is one of the most spoken languages, ranked seventh in the world. The National Anthem of Bangladesh, National Anthem of India, National Anthem of Sri Lanka and the national song of India were first composed in the Bengali language.” ( source : http://www.wikipedia.org )
Surprisingly you will not find any mention of Bengali speaking population of Jharkhnad whereas there are vast Bengali speaking population in Jharkhand. As an evidence of this fact we can quote the Jharkhand Government (Arjun Munda Govt.) order of the year 2002, declaring Bengali (Bangla) and Santhali as second official language of Jharkhand.
Therefore, whenever there is a talk of Bangla Bhasa (Bengali Language), the Jharkhand should be taken into account for its vast Bengali population.
BENGALI POPULATION IN JHARKHAND (PART OF MANBHUM)
Bengali speaking population of Jharkhand are settled in the area of East and West Singhbhum District, Saraikela, Kharsawan, Silli Tamar Bundu area of Ranchi, Chas, Chandankyari of Bokaro dist, Dhanbad District, Jamtara District, Dumka and Pakur district.
Still no mention of facts of this vast population of Bengali speaking people in Jharkhand because Govt. always wants to suppress the fact and since 1956, they forcefully imposed Hindi on these Bengali speaking Population Manbhum (now in Jharkhand). That being the one of the reasons the next Govt. again changed the status of the Bengali Language and made Urdu as second official language of Jharkhand for vote Bank politics.
As you know Manbhum was always part of Bengal. Till 1912 it was part of Bengal presidency. Letter it was part of Bihar but official language was Bengali till 1956.
Hindi came to Manbhum area only 100 years ago. Even 50 years back no body in Manbhum area could speak Hindi. Post 1956, Hindi has been forcefully imposed on the vast Bengalis speaking population of erstwhile Manbhum District (now Jharkhand).
The Original Bengalis in Jharkhand of the above areas, are the moolnibashi Bangla Bhashi people and they are not the Migrants or Settlers from anywhere else. They are the son of the soil, original dwellers of that land for more than 300 years. It is unfortunate that Bengal was never interested to protect the Bangla language and and the culture of that part of Manbhum areas by placing strong demand for inclusion with West Bengal (with Purulia District) in the year 1956. Had it been done so, today West Bengal’s geography would have been different and it would have become a reachest state of India with the “Black Diamond” Coal belts and mineral reach areas.