The government of the state of Michigan has done its best to tax all manufacturing out of existance. The rust belt became such thorugh overregulation and overtaxation, as well as unsustainable employee benefits and pay due to union coersion.
Michigan has the 6th highest state income tax, and 4th highest sales tax, and 17th highest property taxes, making it the 10th overall largest tax burden in the USA(
www.taxfoundation.org) which I believe lead to that state being one of only 3 states with negative economic growth in 2006. Add to that a regulatory environment that ranks it third worst for business in the nation ahead of only California and New York (
www.chiefexecutive.net) and it should amaze you that the big 3 have survived as long as they have in Michigan.