Answer:
Plessy v. Ferguson
Step-by-step explanation:
The Plessy v. Ferguson case happened in 1896. The decision from this case effectively started the Racial Segregation in United States. During the segregation, the government separated the public infrastructures into two: Those who can be used by white citizens only and those who can be used by black citizens only. This infrastructures cover all facilities ranging from Schools, Public Transportation, public bathrooms, etc.
But, the facilities provided for the Black citizens tend to be lower in quality compared to the facilities provided for white citizens. This led to a deeper problem for the Black community. For example, Due to the low quality of schools for black citizens, they produce a generation of graduates who has lesser chance to obtain high paying jobs. This prevented the black community to advance in society.