William came to Keokuk County, Iowa in the early 1850s.
William's parents are named in his son Leslie's obituary as David
Morgan and Mary Evans. As far as I know, they aren't related to
William's mother-in-law, Jane Chlo Morgan. Although, coincidentally,
Jane Chlo had a brother Lewis who married Nancy Evans and
they had a son William born in July of 1833. But with all that is
written about Jane Chlo and family, I think someone would have picked
up on it if William Allen Morgan were related.