Starting in 1680, the coureurs des bois invaded the heart of the continent and extended the presence of the French past Green Bay (west of Lake Michigan). Numerous trading posts were set up near Jesuit missions and Indian villages. To counter the expansion of trade between the French and the southern Algonquians, the Iroquois multiplied their incursions into the Lake Michigan region. The Miami, the Illinois and other nations in the area refused to trade with them, which led to numerous conflicts and the resumption of the Iroquois wars.  
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