Question

why was bengal divided by the british in 1905 ​

Answer 1

Muslims were in favour of this partition relieving them from lower condition under the Hindu hegemony. So, partition of Bengal was held under the auspicious of Lord Curzon, British viceroy of India in 1905...

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Answer 2

In 1903, the Viceroy of Bengal, Lord Curzon, divided Bengal and the reason given for the division was that Bengal was a very large province and the division is for better administrative efficiency but the British, however, had political reasons for dividing Bengal as there was a powerful wave of nationalism in Bengal, which they wanted to Crush.