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In the latter part of the 1600s, threat of violence from the Iroquois nation forced missionaries and fur traders to leave the Sault. After peace was established in 1701, French activity was focused on Michilimackinac with its access to the Ohio Valley, the lower lakes, and the Mississippi Valley.
At about the same time, the French closed all of their Lake Superior outposts except one - Chequamego, in the area that is now Wisconsin. Because of its proximity to the far western fur trade, Chequamego became more important to the French than the Sault.
The French were expelled from North America in 1763, and the United States Supreme Court officially ruled their claim to the area to be invalid in 1867.
From 1763 until after the War of 1812, the Sault was a center for British fur trade.
In 1837, after it had become a state, Michigan commissioned the building of a canal connecting Lake Huron with Lake Superior, but the project failed.
After years of congressional fighting, 750,000 acres of federal land was deeded to Michigan in 1852. The state used this land to compensate the company that would make the second attempt at building the canal.
Two 350-foot locks were arranged in tandem, completing a one-mile canal between the two lakes. On June 22, 1855, the “Illinois” became the first ship to pass through the completed locks. The Sault Locks were transferred to the U.S. Army Corps of Engineers in 1881.
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