What was the reason for the March on Washington protest?

Answer 1

The general goal of the march was racial equality.

However, the march was put together by a handful of different groups, which had different goals. The stated purposes were the passage of meaningful civil rights legislation; the elimination of racial segregation in public schools; protection for demonstrators against police brutality; a major public-works program to provide jobs; the passage of a law prohibiting racial discrimination in public and private hiring; a $2 an hour minimum wage; and self-government for the District of Columbia,

Answer 2

The March on Washington happened because the lack of racial equality and discrimination around the world, It happened with the help of six civil rights organizations called the "Big Six"

You can learn more about it here:

http://www.infoplease.com/spot/marchonwashington.html

Hope this helps!