By Nandita Bose and Jeff Mason WASHINGTON (Reuters) -Judge Ketanji Brown Jackson on Friday celebrated her historic confirmation as the first Black woman to serve on the U.S. Supreme Court with a declaration that “anything is possible” in America and a reference to fulfilling the dreams of slaves. Jackson, a federal appellate judge, was confirmed to the lifetime post by the Senate on Thursday on a 53-47 vote in a milestone for the United States and a political victory for Democratic President Joe Biden, who nominated her in February. Jackson, 51, will replace the retiring Justice Stephen Breyer…