What was the term used to describe the belief that it was America's destiny to expand across the continent?

The belief that it was America's destiny to expand across the continent is referred to as Manifest Destiny. This concept emerged in the 19th century and encapsulated the idea that the United States was preordained to spread its democracy and ideals from the Atlantic Ocean to the Pacific Ocean. Proponents of Manifest Destiny saw this expansion as a moral obligation and a way to bring civilization and progress to the western territories.

The term captures the spirit of the era, which embraced both the opportunities and challenges of westward migration, including the displacement of Native American tribes and the implications of slavery in new states. Manifest Destiny was a driving force behind key events in U.S. history, such as the annexation of Texas and the Mexican-American War, ultimately shaping the nation’s borders and identity. Other options do relate to American history but do not specifically refer to this guiding ideology of expansion.