While Jackie Robinson's breakthrough in 1947 opened the gates of opportunity for African Americans and other minority players, it was not until 1971 when a team first enjoyed a full and complete level of integration, with half of its twenty-five-man roster comprised of players of African American and Latino descent. That team was the Pittsburgh Pirates, managed by an old-time Irishman.
The Team that Changed Baseball: Roberto Clemente and the 1971 Pittsburgh Pirates [Book]
Diversity milestone: '71 Pirates had an all-Black lineup - Los Angeles Times
The First All-Minority Lineup, The lineup that changed baseball., By Pittsburgh Pirates
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The day the Pirates fielded the first all-Black and Latino lineup
On This Day: Pittsburgh Pirates Field MLB's First-Ever All-Minority Lineup
Pittsburgh Pirates - Wikipedia
On Sept. 1, 1971, the Pirates made history with baseball's 1st all-minority starting lineup
Diversity milestone: '71 Pirates had an all-Black lineup - Los Angeles Times