The impact of Manifest Destiny on American territories was profound, as it fueled the expansionist mindset that saw the United States grow from coast to coast. Manifest Destiny was the belief that Americans were destined by God to spread democracy and capitalism across the North American continent. This ideology prompted the annexation of Texas, the Oregon Trail migration, and the acquisition of California and other territories following the Mexican-American War. It led to significant demographic changes, indigenous displacement, and conflicts over slavery in new states, shaping the cultural and political landscape of the nation and leaving a lasting legacy on American identity.