What was the primary belief of those who supported manifest destiny?

The belief that divine support justified territorial acquisition is central to the concept of manifest destiny. Proponents of manifest destiny held that it was not only their right but also their God-given duty to expand the United States across the North American continent. This view was often intertwined with a sense of American exceptionalism, suggesting that the U.S. had a unique role in spreading democracy and civilization. The idea that expansion was divinely sanctioned helped to rally support for various territorial acquisitions, including the annexation of Texas and the Oregon Territory.

While economic motivations and military considerations were also factors in the expansionist agenda, they were often framed within the context of this divine justification. Supporters cited a moral imperative to spread what they considered to be the benefits of American society, reflecting a deeply held belief that their expansion was part of a larger, predetermined plan. This belief system significantly influenced U.S. policy and actions during the 19th century, leading to both domestic and international conflicts over territory and governance.