Yes if u wonna be american before this the sign was magna carta
Answer: They need people to support their ideas through the government.
The correct answer here would be de jure segregation.
Jim Crow laws are a perfect example of the de jure segregation as they legalized the separation of races and de jure segregation refers especially to the laws that systematically enforced (and they were enforced harshly) both social and physical separation of African Americans. This referred to all aspects of public life.
Laws passed by the national government and all treaties are supreme law.