Jinnah insisted that the league be recognized as the "sole spokesman" of Muslims.

Explanation:

The person who insisted that the league be recognized as the "sole spokesman" of Muslims was Muhammad Ali Jinnah. Jinnah was a prominent political leader in British India and played a significant role in the creation of Pakistan.

1. Muhammad Ali Jinnah:
Muhammad Ali Jinnah was a lawyer by profession and a member of the All India Muslim League. He believed in the idea of a separate nation for Muslims, which eventually led to the creation of Pakistan. Jinnah argued that Muslims needed a separate entity to protect their political, social, and economic rights in a predominantly Hindu-majority India.

2. Formation of the All India Muslim League:
The All India Muslim League was formed in 1906 to represent the interests of the Muslim community in British India. Initially, the league aimed to safeguard the rights of Muslims within the Indian National Congress, which was the main political party at the time. However, as tensions between Hindus and Muslims grew, Jinnah and other league leaders started advocating for a separate Muslim state.

3. Lahore Resolution, 1940:
In 1940, the All India Muslim League held its annual session in Lahore, where they passed the historic Lahore Resolution. This resolution demanded the creation of independent states for Muslims in regions where they were in a majority. It became the foundation for the eventual formation of Pakistan.

4. Jinnah as the "sole spokesman" of Muslims:
As the leader of the All India Muslim League, Jinnah asserted that the league should be recognized as the "sole spokesman" of Muslims. He believed that the league represented the aspirations and interests of the Muslim community and that it should have the exclusive authority to negotiate with the British government and other political parties on behalf of Muslims.

In conclusion, Muhammad Ali Jinnah insisted that the All India Muslim League be recognized as the "sole spokesman" of Muslims. His leadership and advocacy for a separate Muslim state eventually led to the creation of Pakistan in 1947.