How the First World War helped in the growth of the National Movement in India?

War created a new political and economic situation.

1. The war led to a huge increase in defence expenditure which was financed by war loans and increasing taxes. Custom duties were increased, and income tax was introduced.
2. Forced recruitment in villages caused widespread anger.
3. Crops failed; this resulted in an acute shortage of food.
4. 12 to 13 million people died due to famines and epidemics.