Assertion is nothing but a belief or act which was made by the Britisher's to differentiate the people of India on basis of their caste creed and sex
some  people were know as backward classes,because of such assertion it was difficult for them to seek social help .and some people were also called as dalits
the assertion of dalits were done in the follwing two ways
the phase of Republican Party of India;the phase of Dalit Panther and the phase of Bahujan Samaj Party (BSP).