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In page St. Louis:

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European exploration of the area was first recorded in 1673, when French explorers Louis Jolliet and Jacques Marquette traveled through the Mississippi River valley. Five years later, La Salle claimed the region for France as part of La Louisiane, also known as Louisiana. The earliest European settlements in the Illinois Country (also known as Upper Louisiana) were built by the French during the 1690s and early 1700s at Cahokia, Kaskaskia, and Fort de Chartres. Migrants from the French villages on the east side of the Mississippi River, such as Kaskaskia, also founded Ste. Genevieve in the 1730s.[citation needed]