Etienne de Veniard and Sieur de Bourgmont is the correct answer.
Platte River
The Platte River is a major river in the State of Nebraska. It is about 310 mi (500 km) long; measured to its farthest source via its tributary, the North Platte River, it flows for over 1,050 miles (1,690 km). The Platte River is a tributary of the Missouri River, which itself is a tributary of the Mississippi River which flows to the Gulf of Mexico. The Platte over most of its length is a broad, shallow, meandering stream with a sandy bottom and many islands—a braided stream.
South Platte River
The South Platte River flows from its headwaters in the Mosquito Range west of South Park across Colorado's northeastern plains. From downtown Fairplay to the Nebraska border at Julesburg, its course through Colorado is approximately 380.3 miles
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