Americans believed it was ordained that they expand westward for land, resources, and new opportunities. However, this movement displaced Native American groups like the Sauk, who were forced off their lands after conflicts like the Black Hawk War and relocated beyond the Mississippi River. Treaties like Fort Laramie attempted to establish boundaries but were repeatedly violated by westward-bound American settlers. Trails like the Santa Fe, Oregon, and Mormon trails helped facilitate westward migration for trade, farming, and religious freedom, leading the U.S. to eventually annex the Oregon Territory up to the Puget Sound.