Today, this region of the United States and Canada is home to 107 million people living in iconic cities like Milwaukee, Chicago, Detroit, Cleveland, Pittsburgh, Buffalo, Toronto, and Montreal, making it the 12th largest nation in the world by population, if it were a country. Encompassing eight states, from New York to Minnesota, and the provinces of Ontario and Quebec, this region forms 75% of the 5,525-mile (8,891 km) border between the two countries.