Old, bad, segregation: Separate African Americans to keep them from contaminating whites:
Jim Crow laws were state and local laws enforcing racial segregation in the Southern United States. Enacted after the Reconstruction period, these laws continued in force until 1965. They mandated de jure racial segregation in all public facilities in states of the former Confederate States of America, starting in 1890 with a "separate but equal" status for African Americans.
New, good, segregation: Separate African Americans to keep whites from contaminating them:
The University of Connecticut is hoping that black males will graduate at a higher rate if they spend more time with one another, and is building a new residence hall to facilitate just that.
I kid. It's really all the same.