What significant contributions did rosa parks made on the world?

I think the most important contribution Rosa Parks made was that, in her act of defiance, she proved that it is possible for a person to make a stand against an unjust law. She may not have meant to become the figure that she did in history, and in the greater scheme of things her action was not that huge, but what she did was act instead of sitting idly by and allowing an unjust law to continue to exist.