The government of illinois were scared of the religion (scared of the unknown)
The ruling of Brown v Board of Education changed race relations in the USA during the 50's by having children be able to be in the same school together, but it also made many people angry and had parents protesting outside schools. So it had negative and positive affects for people, but overall ended the belief of "separate but equal" in the United States.
Assasination of prince, invasion, russia, germany
Lots of random acts/laws were put into place to make things hard for southern blacks. For example, literacy tests and fees to be able to vote were instituted in some states as blatant ways to stop blacks from voting.