Compare maps of the world in ancient times with current political maps. Use the maps below to answer the following question.

Compare the two maps. Which geographical feature formed the western boundary of the Plains Native American cultural region?
he Appalachian Mountains
the Rocky Mountains
the Mississippi River
the Pacific Ocean

The correct answer is B. The Rocky Mountains.

Explanation

Maps show landforms in the United States, including the Great Plains, the Plateau, the Rocky Mountains, the Great Lakes, the Mississippi River, the Appalachian Mountains, among others. In both maps, the location of the great plains and their western border, the Rocky Mountains (brown on the map to the right), which divide the plateau, the great basin, and the southwest plains, coincide. According to the above, the correct answer is B. The Rocky Mountains.

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