Answer : 1. "1905"
Explanation :

Bengal Partition

1. In 1905, Lord Curzon divided the Bengal province of India into two parts.

2. West Bengal was Hindu majority, while East Bengal was Muslim majority.

3. The purpose of this partition was to create a Muslim-majority province in India, but instead, it led to communal tension and strengthening of the Indian national movement.

4. Opposition to the Partition of Bengal was widespread across India, and it was eventually annulled in 1911.