WASHINGTON (Reuters) - U.S. President Donald Trump on Thursday issued a pardon for the late boxer Jack Johnson, an African-American convicted a century ago for the crime of taking a woman across state lines, saying the move corrected a wrong in American history. The heavyweight champion was arrested in 1912 with Lucille Cameron, a white woman who would later become his wife, for violating the Mann Act, a law that had passed two years earlier in response to a morality campaign.