Final answer:
The photograph by William Henry Jackson that was interpreted as a sign of divine blessing for manifest destiny was of the Mountain of the Holy Cross.
Step-by-step explanation:
The photograph taken by William Henry Jackson that was viewed as a symbol of divine endorsement of the concept of manifest destiny was the Mountain of the Holy Cross. In the mid-19th century, America's westward expansion was often justified by the belief in manifest destiny, the idea that the United States was ordained by God to spread across the continent. The cross-shaped snow formation on the side of the mountain that Jackson captured in his photograph was interpreted by many as a divine endorsement of this idea, further fueling the westward movement.
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