The expedition under stephen h. long mistook the river for the red river and abandoned their mission in 1820. a. arkansas b. missouri c. canadian d. mississippi

|C. Canadian river is the correct answer.

Explanation:

Stephen Hariman Long was topographical engineer, inventor and railway engineer. He is well known for his designs of early locomotives. He also worked as an explorer but this career was short lived. During his explorations he covered over 26000 miles that included expeditions of the great plain area (He gave it the name Great Desert). He led expedition up the Minnesota river in 1823 and expedition to the Red river of Texas and Oklahoma. Stephen Long  and his men came upon the Canadian River on August 4, 1820 and mistook it for the Red river. In a later expedition they were able to find the Red river.

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