Manifest Destiny: The belief held by many Americans during the 19th century that it was their God-given right and destiny to expand westward across the continent, which resulted in conflicts with Native American tribes and other nations.
Indian Removal Act: A law passed in 1830 under President Andrew Jackson that authorized the forced removal of Native American tribes from their ancestral lands in order to open up more territory for white settlement.
Oregon Trail: A historic route used by pioneers during Westward Expansion to travel from Missouri to Oregon in search of new opportunities, which often led to conflicts with Native American tribes along the way.