Which term describes 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 best described by the term Manifest Destiny. This concept emerged in the 19th century, particularly during the 1830s through the 1850s, as a justification for westward expansion. Proponents of Manifest Destiny argued that it was not only the right of Americans but also their duty to spread democracy and capitalism across North America. This belief was rooted in a combination of cultural, political, and economic factors, reflecting a sense of national destiny that entailed a mission to lead and civilize the continent's indigenous populations and to conquer new territories.

Manifest Destiny played a significant role in events such as the annexation of Texas, the Oregon Trail migrations, and the Mexican-American War, leading to substantial territorial gains for the United States. The term itself encapsulates the strong sentiment of nationalism that characterized this period, as many Americans viewed expansion as both a privilege and a moral imperative. The idea was often expressed in literature, politics, and the media of the time, reinforcing the notion that America was destined to stretch from coast to coast.