According to this timeline, what was the effect of the Civil War?

Read this excerpt from i never had it made. he had never forgotten the agony of that black athlete. when he became a front-office executive in st. louis, he had fought, behind the scenes, against the custom that consigned black spectators to the jim crow section of the sportsman's park, later to become busch memorial stadium. his pleas to change the rules were in vain. those in power argued that if blacks were allowed a free choice of seating, white business would suffer. which statement best summarizes this excerpt? because he learned so much as a coach, rickey does a thorough job working as an executive at sportsman’s park. inspired by the injustices he witnessed as a coach, rickey tries unsuccessfully to change race rules about stadium seating. rickey was bothered by the treatment of black athletes on his team, so he tries to them find stadium jobs later in his career. rickey remembers how unfairly his black athletes were treated, and he abolishes jim crow laws as soon as he has the power.