It took Pennsylvania 110 years to form the characteristic shape we know today and another 86 years for the county boundaries to reach their final configuration.  This would enable an ancestor to be born in one county and die in another without ever leaving his family’s property.  Knowing the progression of the formation of Pennsylvania’s Counties is imperative to locating your ancestor.  This book contains maps of each county with supportive information on the date of creation and from which county it was formed.