What landforms did American settlers cross when they migrated from east to west? &
What also encouraged Westward Expansion?

1st question: It stretched for around 2,000 miles and through six different states including Missouri, Kansas, Nebraska, Wyoming, Idaho, and Oregon. Along the way, travelers had to cross all sorts of rough terrain such as the Rocky Mountains and the Sierra Nevada Mountains

Explanation:

2nd question: Signed into law by Abraham Lincoln during the Civil War, the Homestead Act encouraged westward migration and settlement by providing 160-acre tracts of land west of the Mississippi at little cost, in return for a promise to improve the land.