Answer:
humidity oxygen content and salinity are abiotic
When Rosa Parks refused to give up her seat to a white man, this case a big issue. When she did not follow the orders she was later arrested. News soon spred about Rosa Park's arrest.
Martin Luther King Jr. came later and helped to orginize the Mintgomery Bus Boycott. For over a year a lot of African Americans walked everywhere instead of taking the bus. Later the bus drives would be forced to intograte their bus.
Http://nationalinterest.org/blog/the-buzz/why-ulysses-s-grant-was-one-americas-greatest-leaders-17952
