I don't have a John Patrick Halligan in my line. I have a John Aloysius, and a Patrick A., and they all settled in Minnesota and South Dakota. They are sons of James Halligan, born 12 May 1825, and Catherine McCauley , born 26 March, 1830. Place of birth Drogheda, Ireland. This doesn't seem to be a match. However, if you can link them to your line I would like to share our files.