John Johnson built a house in the Germantown section of Philadelphia, Pennsylvania in 1768. A family of ardent Quakers, the Johnsons did not participate in the Revolutionary War and were vocal abolitionists. The Johnson House was a documented stop along the Underground Railroad for African Americans escaping North from slavery prior to the Civil War. Johnson House Historic Site collection on the Johnson family, 1794-circa 1994, includes several original manuscript volumes and photographs from the Johnson family, as well as secondary-source materials such as photocopies and genealogical information about the family.