The action that is a direct result of Americans' belief in the concept of Manifest Destiny is: Westward Expansion.
Manifest Destiny is known to be a phrase that gives the idea that the United States is actually destined by God to dominate the entire North American continent. It's seen that the United States possess divine rights to expand westward.
Thus, the action that is a direct result of Americans' belief in the concept of Manifest Destiny is westward expansion.
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