Manifest Destiny was used to justify the American desire to -

A-control the citizens in the Southern states.

B-expand the United States from the Atlantic to the Pacific Ocean.

C-warn European countries not to form new colonies in South America.

D-limit the number of immigrants coming into the United States.

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To determine the correct answer, we can break down the term "Manifest Destiny" and its historical context. Manifest Destiny was a belief that emerged in the 19th century United States, asserting that it was the nation's "destiny" or inherent right to expand its territory westward from the Atlantic to the Pacific Ocean.

Option A, controlling the citizens in the Southern states, does not align with the concept of Manifest Destiny. Manifest Destiny focused on westward expansion, not control within existing borders.

Option C, warning European countries not to form new colonies in South America, is unrelated to the concept of Manifest Destiny. Manifest Destiny primarily concerned the expansion of the United States rather than influencing European colonization in South America.

Option D, limiting the number of immigrants coming into the United States, is not directly tied to Manifest Destiny. While immigration policies may have been influenced by factors such as westward expansion, Manifest Destiny itself was not about immigration restrictions.

That leaves us with option B, expanding the United States from the Atlantic to the Pacific Ocean. This choice aligns with the fundamental idea of Manifest Destiny. Advocates of Manifest Destiny argued that the United States had a divine right to extend its influence and territory to the western coast. This concept justified various actions, including the annexation of Texas, the Mexican-American War, and the acquisition of territories such as California, Oregon, and the southwestern states.

Therefore, the correct answer is B: expand the United States from the Atlantic to the Pacific Ocean.