...enty years later mission stations were established at Kaskaskia, Cahokia, and Peoria; and early in the eighteenth century a French monastery was established at Kaskaskia. By the treaty of 1763, the Illinois country, as it was called, passed under the jurisdiction of the English. By the treaty of 1783 it was ceded to the United States, and it formed a part of the Northwest Territory. The country c...