In 1780 the American revolutionary war was raging, Charleston, South Carolina was taken by British forces, British troops inflicted heavy losses on a Patriot army at Camden, South Carolina, and Benedict Arnold fled to British-held New York. In Europe First performances: Symphony No. 34 in C major by Wolfgang Amadeus Mozart, in July at Salzburg; Symphony No. 75 in D major by Joseph Haydn at Schloss Esterházy.

Alexander Miller was born around 1780 - 83 in Lancaster County , Pa  and he died  in 1803 or 1804 in Lancaster.  see Miller name origin here.  We don't have information about whether he was of English or German origin, but this area had a very high percent of Germans and Miller was a common name.

1800 census with Alexander Miller in Pennsylvania here and 1790 census here

John Sawhill left Ireland in the 1790's with three children, including daughter Isabella Sawhill (born in 1782) who would marry Alexander Miller on August 10, 1801.

On May 30, 1802, their only child, Samuel Miller was born in Lancaster County Pennsylvania. Samuel was only two when his father died. Samuel and his mother moved westward with his uncles arriving in  Washington Count, PA in 1803. His  mother remarried David McConaughy. In 1817 they moved to Deerfield, Ohio on the banks of the Mahoning river. Samuel followed the trade of carpentry.