Question: Of Thee I Sing: A Letter to My Daughters is a children's book by former United States President Barack Obama, the stories of thirteen Americans are told in the book, including Jackie Robinson, who was an American professional baseball second baseman who became the first African American, to play in which organization?
Sentence (from "Jackie Robinson"): Jack Roosevelt Robinson (January 31, 1919 – October 24, 1972) was an American professional baseball second baseman who became the first African American to play in Major League Baseball (MLB) in the modern era.
Relevant evidence: Yes