Jackie robinson movie in the year 1947, how many major league baseball teams were in existence

Was an American professional baseball second baseman who became the first African American to play in Major League Baseball  in the modern era. Robinson broke the baseball color line when the Brooklyn Dodgers started him at first base on April 15, 1947. The Dodgers, by signing Robinson, heralded the end of racial segregation in professional baseball that had relegated black players to the Negro leagues since the 1880s.Robinson was inducted into the Baseball Hall of Fame in 1962.[