UnGoogleable Research – What I Already Know

My focus question is “Why was the color barrier in professional baseball created?" I already know who was involved in the color barrier which was Jackie Robinson. I also know that he broke the color barrier in 1945. Additionally, Jackie Robinson was the first African American baseball player ever to play in the major leagues, he also went been to six world series appearances but only won one of those six. By doing research, I hope to learn more about what was going on before and after he made it to the majors, also exploring the time line through the years 1940-1950.