The external circumstances responsible for the failure of the plan of diarchy system are as given below:
1. Negative Behaviour of Bureaucracy:
The British public servants were not ready to work under Indian ministers. Their behaviour was always negative.
2. Non – cooperation of Congress and Muslim League:
There was no mutual reciprocity between two important political parties of British India – Congress and Muslim League. The British policy of “Divide and Rule” had resulted into increase in animosity between them. Both parties were engaged in making their position sound instead of administrative reforms.
3. Inciting Events:
Jallianwala Bagh massacre, Khilafat movement and hard and repressive laws like Rowlatt Act created distrust towards British government among the Indians and caused civil unrest. As a result, an indifferent feeling took place in the hearts of Indians towards reforms started by British government.