Question

What geographical feature formed the western boundary of the Louisiana Purchase?

Answer 1

Answer: Rocky Mountains

Explanation: The EASTERN boundary of the Louisiana Purchase was the Mississippi River. The WESTERN boundary would be the Rocky Mountains.

Answer 2

The treaty set the western boundry of Louisiana along the Sabine and Red rivers which separate Texas and Louisiana, then north along the 100th meridian to the Arkansas River which it followrd. westward to its source in the Rockies, then north to the 42nd north latitude, and on a line then west to the Pacific Ocean.