What is Manifest Destiny?
The belief that America is destined for greatness
The belief that America is manifestly flawed
The belief that God gave America cool people
The belief that America was destined by God to expand west to the Pacific
Ocean

Right choice:

The belief that America was destined by God to expand west to the Pacific.

Explanation:

The Manifest Destiny saw as a natural mission of the United States to expand westward. For its believers, the geography and the history of the country was a signal from God that it was His will. The Manifest Destiny was a drive of expansion in the 19th century.  The goal to reach the shores of the Pacific was achieved in 1848 with the victory in the Mexican-American War.

The belief that America was destined by God to expand west to the Pacific

Explanation:

The Manifest Destiny was the belief of the American People to continue to expand westward, as GOD gave them not only permission but the right to own the land westward. This doctrine made it so that westward expansion was inevitable, and that anything anything that the American people did in the West was justifiable.

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it was the first major victory for the colonists.