In these water-systems Wisconsin was the link that joined the Great Lakes and the Mississippi; and along her northern shore the first explorers passed to the Pigeon river, or, as it was called later, the Grand Portage route, along the boundary line between Minnesota and Canada into the heart of Canada.
It was possible to reach the Mississippi from the Great Lakes by the following principal routes:[62]
1. By the Miami (Maumee) river from the west end of Lake Erie to the Wabash, thence to the Ohio and the Mississippi.
2. By the St. Joseph's river to the Wabash, thence to the Ohio.
3. By the St. Joseph's river to the Kankakee, and thence to the Illinois and the Mississippi.
4. By the Chicago river to the Illinois.
5. By Green bay, Fox river, and the Wisconsin river.
6. By the Bois Brulé river to the St. Croix river.
Of these routes, the first two were not at first available, owing to the hostility of the Iroquois.
Of all the colonies that fell to the English, as we have seen, New York alone had a water-system that favored communication with the interior, tapping the St. Lawrence and opening a way to Lake Ontario. Prevented by the Iroquois friends of the Dutch and English from reaching the Northwest by way of the lower lakes, the French ascended the Ottawa, reached Lake Nipissing, and passed by way of Georgian Bay to the islands of Lake Huron. As late as the nineteenth century this was the common route of the fur trade, for it was more certain for the birch canoes than the tempestuous route of the lakes. At the Huron islands two ways opened before their canoes. The straits of Michillimackinac[63] permitted them to enter Lake Michigan, and from this led the two routes to the Mississippi: one by way of Green bay and the Fox and Wisconsin, and the other by way of the lake to the Chicago river. But if the trader chose to go from the Huron islands through Sault Ste. Marie into Lake Superior, the necessities of his frail craft required him to hug the shore, and the rumors of copper mines induced the first traders to take the south shore, and here the lakes of northern Wisconsin and Minnesota afford connecting links between the streams that seek Lake Superior and those that seek the Mississippi,[64] a fact which made northern Wisconsin more important in this epoch than the southern portion of the state.