Outfielders by Race, MLB 1947-2018

Source:  https://sabr.org/bioproj/topic/baseball-demographics-1947-2016/

As soon as the MLB integrated, the demographics of the outfield began to shift dramatically.  By the early 1970s white outfielders were in the minority, but as the number of black players began to dip in the 1990s, this trend reversed course.