Ok this is a 4x5 but if i wanna do it on paper(my paper is 9x12) how big should my grid be on the paper?

You can just cut the paper to 4x5 then do the same size grids

The theme of social protest remained a consistent focus for jacob lawrence throughout his career. in the 1960s lawrence was inspired by news reports and photographs, including images of segregated lunch counter sit-ins and stories of the   freedom riders in the civil rights movement. from the 1970s onward, lawrence's work focused less explicitly on contemporary social issues.