BIRMINGHAM, Ala. — Standing at the pulpit of the Birmingham, Alabama, church where four little girls were killed by a Ku Klux Klan bomb in 1963, Supreme Court Justice Ketanji Brown Jackson said the nation must remember and own the uncomfortable moments of its past in order to move forward.Jackson, the first Black woman to serve on the nation’s highest court, spoke at the 60th anniversary of the Sept. 15, 1963 bombing at 16th Street Baptist Church.Jackson said they gathered to both grieve the loss of four young …