By the 1840s,westward expansion was well under way in the United States,and many spoke of a "manifest destiny" to occupy all of North America from the Atlantic to the Pacific.

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This statement is true. By the 1840s, westward expansion was indeed well under way in the United States, and the concept of "manifest destiny" had become a popular belief among many Americans.

By the 1840s,westward Expansion Was Well Under Way in the United