Manifest Destiny was an ideological concept that played a significant role in shaping American history. It was rooted in the belief of American exceptionalism, the idea that the United States had a unique destiny to spread its values and institutions across the continent. This belief in exceptionalism was bolstered by the notion of divine providence, the idea that God had chosen and blessed the American people with a special mission.

The idea of American exceptionalism held that the United States was different from other nations and had a moral obligation to extend its influence and democratic principles. This perspective was influenced by Enlightenment ideals and a sense of superiority based on the country's democratic institutions and economic success.

Divine providence further reinforced Manifest Destiny, as many Americans believed that God had ordained their expansion and success. This religiously infused ideology gave them a sense of moral obligation to fulfill their destiny. The concept gained popularity during the early 19th century and provided a justification for the ambitious territorial expansion that followed.

For example, President James K. Polk, a firm believer in Manifest Destiny, used this ideology to justify the Mexican-American War and the acquisition of significant territory, including California, Nevada, Utah, and parts of New Mexico, Arizona, Colorado, and Wyoming. The belief in exceptionalism and divine providence allowed many Americans to view such actions as necessary and ultimately beneficial for the nation's progress.