Partition of Bengal (1905)

The Partition of Bengal in 1905, also known as the First Partition of Bengal, was a territorial reorganization of the Bengal Presidency in British India, implemented by the authorities of the British Raj. Announced on 16 October 1905 by Lord Curzon, then Viceroy of India, the reorganization separated the largely Muslim eastern areas from the largely Hindu western areas, creating West Bengal for Hindus and East Bengal for Muslims.

Source: Wikipedia — Partition of Bengal (1905) (CC BY-SA 4.0)