What does Manifest Destiny refer to in American history?

Manifest Destiny refers to the belief that it was the United States' divine right and obligation to expand its territory across North America. This concept was rooted in the idea that such expansion was not only beneficial but also destined to happen. Advocates of Manifest Destiny believed that it was the nation's fate to spread democracy and civilization from the Atlantic to the Pacific Oceans, which led to significant events such as the Louisiana Purchase, the annexation of Texas, and the Oregon Trail migration.

Understanding this concept is crucial in comprehending the motivations behind America's territorial expansion during the 19th century, including the impact on indigenous populations and the geopolitical landscape of North America at the time. The emphasis on the "right and duty to expand" captures the essence of the belief that inspired many Americans to move west and settle new lands, often justifying the displacement of native peoples and conflicts with other nations.