Two African American men wearing vests , as one African American man wearing a blue shirt with an emblem direct people or machinery .
It is almost certain that the African American men are working in a factory around the turn of the 20th century .
It is impossible that the African American men are working in a factory around the turn of the 20th century .
It is almost certain that the African American men are working in a factory around the turn of the 20th century .
The African American men are working in a factory around the turn of the 20th century .