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The main idea behind Manifest Destiny in the 1800s was indeed a belief in American expansion across the continent. This ideology held that it was the destiny of the United States to expand its territory and spread its values and culture from the Atlantic Ocean to the Pacific Ocean. Proponents of Manifest Destiny viewed westward expansion as a moral obligation and a divine right, suggesting that Americans were chosen to spread democracy and civilization. This belief significantly influenced U.S. policy, leading to the annexation of territories, conflicts such as the Mexican-American War, and the displacement of Native American populations.

The other choices do not capture the essence of this movement as accurately. Although there may have been elements of promoting democracy in the context of expansion, the central focus of Manifest Destiny was primarily territorial growth rather than a broader global political agenda. The idea of rejecting outside influences relates more to isolationist attitudes rather than the expansionist vision of Manifest Destiny. Finally, while constitutional developments occurred during this period, Manifest Destiny was not fundamentally a campaign to establish a new constitution; rather, it was about expanding existing American territory and influence.