when did lumbering and mining become important in michigan
History of Michigan When iron and copper were discovered in the Upper Peninsula, impetus was created for the construction of the Soo Locks, completed in 1855. Along with mining, agriculture and logging became important industries.[5] In 1899 Henry Ford built his first automobile factory in Highland Park, an independent city that is now surrounded by Detroit. General Motors was founded in Flint in 1908. Automobile assembly and associated manufacturing soon dominated Detroit, and the economy of Michigan.