What was Jackie Robinson’s unique contribution to the United States?

400 word minimum

Resources:

Chapter 9: Patrick B. Miller and David K. Wiggins, Sport and the Color Line, Black Athletes and Race Relations in Twentieth-Century America.

http://www.jstor.org/stable/27774174?seq=1#page_sc…

http://unlv.kanopystreaming.com/video/ken-burns-ja… Jackie Robinson part 1

http://unlv.kanopystreaming.com/video/ken-burns-ja… Jackie Robinson part 2