Westward Expansion: This term refers to the period of U.S. history when settlers moved westward across the continent, often driven by the idea of Manifest Destiny.
Oregon Trail: A 2,170-mile route from Missouri to Oregon used by pioneers during the mid-1800s. It symbolizes one aspect of Manifest Destiny - moving west for new opportunities.
Indian Removal Act: Passed in 1830 under President Andrew Jackson, this act forced Native American tribes living in southeastern U.S. states towards lands west of Mississippi River - another example of expansion tied with Manifest Destiny.