Question

The ____________ borders the Louisiana Purchase on the east and the _____________borders the Louisiana Purchase on the west.

Mississippi River / Rocky Mountains

Missouri River / Appalachian Mountains

Mississippi River / Missouri River

Rocky Mountains / Mississippi River

Answer 1

I believe the answer is Mississippi River and the Rocky Mountains, But I would like to have @Elsa213 look over this.

Answer 2

Seems to me that to obtain factual info and to learn something interesting, google-ing "Louisiana Purchase" would be the way to go. Read anything about Lewis and Clark? They were among the very first to explore the Louisiana Purchase and points further west in 1804.