Why are people discriminated against in the society

In simple terms word​

People are discriminated against for a various amount of reasons. Race, Sex/gender, sexuality, economic class, etc. If these certain qualities do not fit into what society find acceptable then they are discriminated against for it.

This is the simplest way to answer the question.

It developed as a reaction to the impact of european colonialism in africa on peoples of african descent. in the  mid-20th century, activists in africa adopted pan-africanism as a rallying cry for independence from colonial rule. some african pan-africanists sought to unite the continent as one independenthope it was useful