This area had long been occupied by the Onondaga people, a nation of the Iroquois Confederacy, a Native American coalition of tribes who controlled most of upstate and western New York around the Great Lakes by the 15th century. Because most nations of the confederacy had allied with the British in the American Revolutionary War, after the defeat of Britain the United States forced the Iroquois to cede most of their land in New York under the terms of the peace treaty. The tribes moved to Canada, where the British offered them land in what is now Ontario.