Answer:
The correct answer to the question: Jackie Robinson´s breaking the color line in professional baseball was an important step in social change but it was not sufficient to alleviate racism in baseball, would be, true.
Explanation:
The hiring of Jackie Roosevelt Robinson by the manager of the Brooklyn Dodgers, Branch Rickie, in 1947, became a major step in de-segregating a sports that up until then had had mixed up feelings about using white and black players in their teams, but whose managers were not ready to be the first to give the step. On the one hand, there were those who opposed the whole crossing the color line, because segregation ensured more money, as minor league black baseball teams spent money renting out stadiums from white-managed major league teams. But on the other, managers and coaches recognized the stamina and value of black players for their teams. Branch Rickie gave the major step, and after him came others like him, but the truth is that the real change did not come immediately, but rather, in small scaffolds, as people were not ready yet to completely de-segregate. However, it did become a major back-up for the whole Civil Rights Movement. This is why the statement is true.
