What is going on historically in the 1950s-1970s that creates so much social upheaval in america?

During 950-70, the racial discrimination was fought. Courts ordered desegregation of schools. The expansion of civil rights movement occurred in 1960. Social mobility and comfort were observed post-war. in 1964, President Johnson enacted the Civil rights act, in the memory of Kennedy. 
All of these events upheaved social prosperity and equality in America.

This act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.