John, the Isle of Man is not part of either England or Scotland, but is self-governed - part of the British Isles, not the UK.

If US records show that your John Robert Wattleworth was b. March 1853 in England (1900 census), you need to buy his birth certificate first, before investigating whether his father was born in the Isle of Man. One step at a time.

Where is he in the 1880 and 1890 censuses, and what details are given there? What does his marriage cert/death cert say? Have you checked all the John Wattleworth entries in: search.labs.familysearch.org/recordsearch/start.html# ? There seems to be a lot missing about him in US records, which need investigating first.

Sue