where was he born?
Delaware County , Pennsylvania.
James B. Longacre
James Barton Longacre was born on a farm in Delaware County, Pennsylvania, on August 11, 1794. 
where was the three-cent nickel minted? United States Bureau of the Mint. who designed it? James B Longacre.
wiki:13972427
James B. Longacre [SEP] Early life; private sector career
James Barton Longacre was born on a farm in Delaware County, Pennsylvania, on August 11, 1794. His mother Sarah (Barton) Longacre died early in his life; his father, Peter Longacre, was the descendant of early Swedish settlers of North America. When Peter Longacre remarried, his son found the home life intolerable, and James Longacre left home at the age of 12, seeking work in the nearby city of Philadelphia. He apprenticed himself at a bookstore; the owner, John E. Watson, took the boy into his family. Over the following years, Longacre worked in the bookstore, but Watson realized that the boy's skill was in portraiture.