"You can't imagine the baseball league not being integrated. There are no more "Whites Only" signs posted anywhere in this country. Although it still happens, it is far less acceptable for someone to yell out a racial slur while you're walking down the street," she told the students. "That kind of prejudice is simply just not something that can happen in the light of day today."
After playing for the Negro Baseball League and the International League, Robinson became Major League Baseball's first black player on April 15, 1947, batting for the Brooklyn Dodgers. His number was 42.
Barack Obama broke a similar barrier in politics by winning election in 2008 as the first black U.S. president.
Mrs. Obama said the Robinsons' story is a reminder of the hard work it takes to move a country forward.
"It reminds you how much struggle is required to make real progress and change," she said, echoing her husband.