How did the Oregon Trail help expand US territory to the west? A) It made it easier for wagons to travel over land. B) It let people cross the Great Plains more easily. C) It let people cross the Sierra Nevada Range more easily. D) It made it easier for steamboats to move up the Ohio River.

A It made it easier for wagons to travel over land.

Explanation:

The Oregon Trail was a major route that people took when migrating to the western part of the United States. Between 1841 and 1869, hundreds of thousands of people traveled westward on the trail. Many of them traveled in large wagon trains using covered wagons to carry their belongings.

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