The Origin of the Family Private Property and the State
 The Origin of the Family Private Property and the State: in the light of the researches of Lewis H. Morgan (Der Ursprung der Familie des Privateigenthums und des Staats) is a historical materialist treatise written by Friedrich Engels and published in 1884. It is partially based on notes by Karl Marx to Lewis H. Morgan's book Ancient Society. The book is one of the first major works within the family economics.