The new argument in the 1840s made by nationalist movements for westward expansion was based on

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The new argument made by nationalist movements for westward expansion in the 1840s was based on the idea of fulfilling the nation's destiny. This concept, known as Manifest Destiny, asserted that it was the fate of the United States to expand its territory to the Pacific Ocean and beyond, bringing the benefits of American democracy and civilization to the West. Therefore, it was not primarily based on access to the Pacific Ocean, good trade policy, or military strategy.

The New Argument in the 1840s Made by Nationalist Movements