Mrs. Parks challenged an unjust law and was urged to take it to the supreme court to knock down any race-based law , rule, or ordinance in the USA. Before this lawmakers, officials, etc, could enact rules, laws, ordinances based on race! She spent the rest of her life fighting for civil rights. The Supreme court ruled segregation as constitutional 100 yrs before, then changed! Race based laws on every level had to be challenged or struck down up until the 80s because they still remained on the books for example deed restrictions etc.. She did all of us a great service in this country!