Michigan's economy underwent a transformation at the turn of the 20th century. Many individuals, including Ransom E. Olds, John and Horace Dodge, Henry Leland, David Dunbar Buick, Henry Joy, Charles King, and Henry Ford, provided the concentration of engineering know-how and technological enthusiasm to start the birth of the automotive industry.[21] Ford's development of the moving assembly line in Highland Park marked the beginning of a new era in transportation. Like the steamship and railroad, it was a far-reaching development. More than the forms of public transportation, the automobile transformed private life. It became the major industry of Detroit and Michigan, and permanently altered the socio-economic life of the United States and much of the world.