Born in New Woodstock, New York, Ainsworth attended the public schools, and the Oneida Conference Seminary, Cazenovia, New York.
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During the Civil War entered the Union Army in 1862 as captain of Company C, 6th Regiment Iowa Volunteer Cavalry, and served three years in areas of conflict with Native American tribes in the northern Great Plains.
Lester Young | Richard Lester | Lester Maddox | Lester B. Pearson | Lester Piggott | Lester Bangs | Lucien Bonaparte | Lester Bowie | Mary Ainsworth | Lucien Favre | Lucien Lelong | Lester L. Grabbe | Lester | Adrian Lester | Lucien Rosengart | Lucien Bouchard | Lester W. Smith | Lester Horton | Ketty Lester | Bruce Lester | William Harrison Ainsworth | Peter Ainsworth | Patrick Lucien Price | Lucien Wercollier | Lucien Lévy-Bruhl | Lucien Gaudin | Lester, Washington | Lester R. Ford | Lester J. Maitland | Lester Flatt |