During the 1916 Congress session at Lucknow two major events occurred. The divided Congress became united.
An understanding for joint action against the British was reached between the Congress and the Muslim League and it was called the Lucknow Pact.
The signing of the Lucknow Pact by the Congress and the Muslim League in 1916 marked an important step in the Hindu-Muslim unity.
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Reunion of the moderates and the extremists took place due to following factors:-
1. Tilak clarified his objective of attainment of self-govt. by constitutional means.
2. Death of Gokhale and Mehta in 1915 softened moderates attitude.
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3. Mrs. Besant played the role of mediator.
4. Congress constitution amended to make possible the entry of extremists. Due to all this, the union was achieved at Lucknow session in December, 1916.