Final answer:
The question is about a French explorer named Rene Robert Cavelier, Sieur de La Salle who established a settlement named Fort St. Louis.
Step-by-step explanation:
The subject of this question is History. The question asks about a French explorer who established a settlement named Fort St. Louis on the banks of the Gracitas River in present-day Victoria County. The explorer's name is Rene Robert Cavelier, Sieur de La Salle.
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