Great Lakes of the lakes: Ontario does not border Lake Michigan, and Michigan does not border Lake Ontario. New York and Wisconsin's jurisdictions extend into two lakes, and each of the remaining states into one of the lakes. As the surfaces of Lakes Superior, Huron, Michigan, and Erie are all approximately the same elevation above sea level, while Lake Ontario is significantly lower, and because the Niagara Escarpment precludes all natural navigation, the four upper lakes are commonly called the "upper great lakes". This designation, however, is not universal. Those living on the shore of Lake Superior often refer to all the
History of Milwaukee in the Great Lakes "rust belt," Milwaukee saw the loss of blue collar jobs and the phenomenon of "white flight." The construction of Milwaukee's interstate highway system, beginning in 1964 with the completion of its first seven miles of I-94, heralded an age of greater decentralization, as southeastern Wisconsin suburbs continued to proliferate along interstate corridors, providing an alternative to crowded city living. Nevertheless, a backlash against the freeway in the late 1960s and early 1970s virtually ground Milwaukee's freeway construction to a halt, leaving the city with about 50% of the highways recommended by the Southeastern Wisconsin Regional Planning