What was the short term significance of Rosa Parks?

Only write within a 20 year period within the years 1877-1981
5 contemporary sources- these contemporary sources must be critically evaluated on the basis of their origin, purpose, value and limitation to the enquiry that I have chosen. Combine the skills of cross referencing and evaluation of sources contemporary to the period.
3-4 secondary sources- no need to evaluate secondary sources but examine and integrate them in the process of discussing claims.