Relier Pairs Westward MovementVersion en ligne Link the pairs. Use the information we saw last week: The westward expansion. par Andrea Hurtado 1 Indian Removal Act 2 western pioneers 3 Indian Removal 4 Oregon Trail, 5 Westward Movement Expansion of the United States westward across the Appalachian Mountains and eventually across the Mississippi River. Threatened by the U.S. Army, most American Indian groups signed treaties agreeing to expulsion. Traders looking for new sources of goods a route that stretched over 2,000 miles from Missouri to Oregon law allowed the federal government to force American Indians to move west