Top 20 cities of Bengal by Hindu and Muslim proportions as of the 1941 census. You can clearly see that most cities in East Bengal at that time were Hindu-majority. After the partition, most of them were forced to leave their ancestral lands by pro-Pakistan forces through riots. The 1946 Calcutta riots were the deadliest riot in global history, resulting in the deaths of 100,000 people. The riot was started by Bihari Muslims. Many of them settled in the backward state of Tripura, Assam, and other Northeast Indian states, leaving Bengal, one of India's most influential provinces. Even there, they faced severe riots and massacres like Bongol Kheda, Mandai, etc. Bengali Hindus are the most persecuted community in the world, but nobody talks about it.