In 1905, Lord Curzon split the large province of Bengal into a largely Hindu western half and "Eastern Bengal and Assam", a largely Muslim eastern half. The British goal was said to be for efficient administration but the people of Bengal were outraged at the apparent "divide and rule" strategy. It also marked the beginning of the organized anti-colonial movement. When the Liberal party in Britain came to power in 1906, he was removed. Bengal was reunified in 1911. The new Viceroy Gilbert Minto and the new Secretary of State for India John Morley consulted with Congress leaders on political reforms. The Morley-Minto reforms of 1909 provided for Indian membership of the provincial executive councils as well as the Viceroy's executive council. The Imperial Legislative Council was enlarged from 25 to 60 members and separate communal representation for Muslims was established in a dramatic step towards representative and responsible government. Several socio-religious organizations came into being at that time. Muslims set up the All India Muslim League in 1906. It was not a mass party but was designed to protect the interests of the aristocratic Muslims. It was internally divided by conflicting loyalties to Islam, the British, and India, and by distrust of Hindus. The Akhil Bharatiya Hindu Mahasabha and Rashtriya Swayamsevak Sangh (RSS) sought to represent Hindu interests though the later always claimed it to be a "cultural" organization. Sikhs founded the Shiromani Akali Dal in 1920. However, the largest and oldest political party Indian National Congress, founded in 1885, is perceived to have attempted to keep a distance from the socio-religious movements and identity politics.

What administer divided the province of Bengal in half?