Viola Davis’s win is the first for an African-American actress in the drama category. In 1966, Bill Cosby was the first African-American actor to win an acting award in any category — an honor he won for three years in a row in the drama category for his role on “I Spy.” Isabel Sanford was the first African-American actress to win the Emmy for best actress in a comedy series, in 1981, for her role in “The Jeffersons.” And the first African-American actor to win best actor in a comedy series w