The decision to partition the state of Bengal was announced by Lord Curzon, the Viceroy of India

_{On July 20, 1905, Lord Curzon, the Viceroy of India at the time, announced the partition of Bengal into two parts: Bengal and Eastern Bengal. The partition came into effect on October 16, 1905, When Bengal was divided on 16th October, 1905, the whole of Bengal observed the day as ‘National Mourning Day’. On the day of division, Hindus and Muslims showed their unity by tying rakhis to each other.}