Why did Mahatma Gandhiji decide to launch a nationwide Satyagraha against the proposed Rowlatt Act? Explain any three reasons. 

The reasons:

 
(i) Rowlatt Act had given the government enormous powers to repress political activities, and allowed detention of political prisoners without trial for two years.

(ii) The Jallianwala Bagh massacre, where police had fired upon peaceful protestors, killing thousands.

(iii) To defend the harsh treaty that was imposed on the Ottoman emperor –the spiritual head of the Islamic world, the Khalifa.