Background: Charles Henry "Chuck" Noll (January 5, 1932 - June 13, 2014) was a professional American football player, assistant coach and head coach. His sole head coaching position was for the Pittsburgh Steelers of the National Football League (NFL) from 1969 to 1991. When Noll retired after 23 years, only three other head coaches in NFL history had longer tenures with one team. After a six-year playing career that included two NFL Championships as a member of his hometown Cleveland Browns, and several years as an assistant coach with various teams, in 1969 Noll took the helm of the then moribund Steelers (which had played in only one post-season game in its previous 36 years, a 21-0 loss), and turned it into a perennial contender.
Context: Noll's legacy includes providing opportunities for African Americans. Under Noll, Joe Gilliam became the league's first African American starting quarterback just a few seasons after the AFL started Marlin Briscoe, and James Harris (Gilliam started ahead of Terry Bradshaw briefly during the 1974 season). In 1975, Franco Harris became the first African American to win the Super Bowl MVP award. During the 1980s, Tony Dungy (who briefly played under Noll in the late 1970s) got his start as an NFL assistant coach, initially as the Steelers' Defensive Backs Coach, and later he became the first African-American Coordinator in the NFL. Noll strongly promoted Dungy as a well-qualified head coaching candidate, but it did not happen for Dungy with the Steelers when Noll retired after the 1991 season. However Dungy did become head coach of the Tampa Bay Buccaneers and later became the first African American coach to win a Super Bowl (XLI) with the Indianapolis Colts.  On August 2, 2007, the field at St. Vincent College in Latrobe, Pennsylvania was dedicated and renamed Chuck Noll Field in honor of the former coach. For more than 40 years the Steelers have held their summer camp at St. Vincent College, as it was Noll's idea to take the team away from the distractions in the city to prepare for the season each year.  Chuck Noll was honored on October 7, 2007 at Heinz Field during the pre-game ceremonies.  On September 30, 2011, Pittsburgh honored Noll by naming a new street after him. Chuck Noll Way connects North Shore Drive to West General Robinson St. The street runs along Stage AE, on the North Shore of Pittsburgh.
Question: What was his legacy?

Answer:
providing opportunities for African Americans.