On Thursday, every Major League Baseball player will don a No. 42 jersey in honor of Jackie Robinson Day. The annual event, celebrated officially since 2004, marks the anniversary of Robinson’s major league debut in 1947, which broke baseball’s color line that stretched back to the 19th century.
Robinson’s signing, a watershed moment in the sport, was far more complicated than it has been portrayed in the years since. The move of Robinson, and every other star, to the National and American leagues contributed to the swift decline of the long-established Negro leagues. And on the heels of M.