Trump noted that a pardon for Johnson, whom he called "one of the greatest that ever lived", had considerable support in Congress, including within the Congressional Black Caucus.
"Sylvester Stallone, who starred in the "Rocky" series", had urged Mr. Trump to grant the pardon, and appeared in the White House on Thursday.
"To be able to be here at the Oval office in Washington, D.C., and to experience the ultimate pardon of Jack Johnson is incredible", said Wilder to Premier Boxing Champions.
"His trials and tribulations were great, his life complex and controversial", Trump wrote in an April tweet.
The U.S. Department of Justice began investigating Johnson for violating the Mann Act nearly from the time it was enacted in 1910, according to the 2004 documentary "Unforgivable Blackness".
In their efforts to prosecute Johnson, authorities first targeted Johnson's relationship with the woman in question, Lucille Cameron, who later became his wife, but she refused to cooperate.
Johnson had been convicted in 1913 for violating a law that makes it illegal to transport women across state lines for prostitution, debauchery or other immoral purposes. Others have looked at this over the years, most thought it would be done, but yes, I am considering a Full Pardon!
Last month, Trump said he was considering the pardon.
During the years between Johnson winning and losing the heavyweight champion title, the boxer fell into legal issues and was repeatedly slammed by the press for his life outside the ring, including blistering criticisms of his romantic relationships with several white women. His federal conviction also prevented him from fighting in many states.
The president's decision resonates in the Triangle because Johnson, a trailblazing fighter who rose to fame unthinkable for a black man during the Jim Crow era, died in a segregated Raleigh hospital - 25 miles from a vehicle crash scene where he was refused aid by a white ambulance driver. His family, including his great-great niece, has long pushed to have him pardoned posthumously.
His great-great niece, Linda E. Haywood, had pressed Trump for a posthumous pardon, and Sen.
The white rage and resentment against Johnson fueled violence: After Johnson defeated white boxer James Jeffries in 1910, white men in NY set fire to a black tenement building, white mobs in Atlanta chased after black people, and a black man in Houston who announced the result of the fight on a street vehicle had his throat slashed by a white man.
In a statement on Thursday, the Arizona senator applauded Trump for the move, saying that Johnson's reputation was ruined by the "racially-charged" conviction. President George W. Bush in 2008 pardoned Charles Winters, an American volunteer in the Arab-Israeli War convicted of violating the U.S. Neutrality Acts in 1949.
Haywood told the Los Angeles Times that some of her family members have been ashamed of Johnson because of his prison sentence.