Mahatma Gandhi decided to withdraw the Non-Cooperation Movement because:
(i) In 1922, at Chauri-Chaura in Gorakhpur, a peaceful mob turned violent and clashed with the police resulting in the death of several policemen.
(ii) Gandhiji felt that the movement was turning violent and satyagrahis needed proper training before they were ready for a mass struggle.
Due to these reasons, Mahatma Gandhi decided to withdraw the Non-Cooperation Movement in 1922.
OR
The First Word War created a new economic and political situation in India because:
(i) It led to a huge increase in defence expenditure which was financed by war loans.
(ii) Taxes were increased, custom duties were raised and income tax was introduced.
(iii) Through the war years, prices increased doubling between 1913 and 1918 leading to hardship for common people.
(iv) The failure of crops in many parts of India had created food shortage.
(v) The Nationalist Movement grew stronger during the war years.