The First World War had a significant impact on India and its nationalist movement. Some of the effects include:

1. Economic impact: India's contribution to the war effort was significant, with troops, resources, and funds being sent to support the British Empire. This led to a drain on resources and a decline in the Indian economy.

2. Rise of nationalism: The war created a sense of disillusionment and resentment among Indians towards the British Empire, who they felt were exploiting their resources and manpower for their own benefit. This led to a rise in nationalist sentiments and movements, with leaders such as Mahatma Gandhi and Jawaharlal Nehru emerging as prominent voices in the struggle for independence.

3. Emergence of new political trends: The war also led to the emergence of new political trends in India, such as the rise of the Muslim League and the demand for a separate Muslim homeland.

4. Montagu-Chelmsford Reforms: The war also played a role in the Montagu-Chelmsford Reforms of 1919, which introduced a limited form of self-government in India.

Overall, the First World War played a significant role in shaping India's nationalist movement and its struggle for independence from British rule.