How did the Congress come to change its views on Partition?

Initially the Congress was against the partition of the country. But in March 1947, the Congress high command agreed to divide Punjab into two halves. One part would constitute of the Muslim-majority areas. The other part would include areas having Hindu-Sikh majority.

Many Sikh leaders and Congress men were convinced that partition of Punjab was a necessary evil. The Sikhs felt that if they did not accept the partition, they would be overpowered by the Muslim majorities. Then they would be dictated and controlled by Muslim leaders.

The similar principle was applied to Bengal. There was a section of Bhadralok Bengali Hindus. They wanted to retain political power with them. They were also apprehensive of the Muslims. As the Hindus were in minority in Bengal, they thought it prudent to divide the province. It would help them retain their political dominance. Thus Congress changed its perception about the partition of the country after adopting a pragmatic approach.