Bengal Partition-
It was announced in December 1903 and realized on 16 October 1905. The reason was an administrative inconvenience as Bengal, with a total population of 78 million, was too big to be administered. It was also done to weaken the heartthrob of Indian Nationalism
On basis of language, they reduce Bengali to a minority – 17 million Bengali and 37 million Hindi & Oriya speakers.