Question

mention any one reason for the rise of assertive nationalism

Answer 1

treatment of Indians in South Africa:Everywhere in South Africa Indians were subject to racial discrimination. They were denied the right to vote and could not enter the buses or railway coaches reserved for the Whites. They were subject to unfair taxation. The Registration Act required them to carry their Identity Cards. In India itself assault by British soldiers often resulted in the death of Indians.

Answer 2

in the second phase of the national movement there emerged a new group who did not with the method and ideology of the early nationalists.
these angry young men stood for complete swaraj . they also wanted to have a mass base agitation for their movement. This group of leaders known as assertive nationalists