Question

what
were the reason for launching non cooperation movement

Answer 1

in his famous book Hind Swaraj 1909 Mahatma Gandhi declared that British rule was established in India with the corporation of Indians Anne Hathaway only because of this corporation .Indian r refuse to corporate British rule in India would collapse within a year and Swaraj would come . Gandhiji believe that if Indian begin to refuse to corporate the British ruler will have no other way than to live India .
this was the reason for launching non cooperation movement