Question

As the victorious lawyer for several landmark desegregation cases, Thurgood Marshall (1908-1993) made crucial contributions to the civil rights movement.
a. Needs citation

b. Common knowledge

Answer 1

A needs a citation because not everyone would know when he lived

Answer 2

Because the information about Thurgood Marshall features his timeline and the desegregation cases themselves aren't necessarily "general knowledge" because although someone may be familiar with Marshall's name, they won't necessarily be familiar with the specific contributions, this fact would need citation.