The third westward surge of settlement reached theappalachian mountainsrocky mountainsmississippi riverpacific ocean

The correct answer is D) the Pacific Ocean.

The third westward surge of settlement reached the Pacific Ocean.

Following the mandate of the "Manifested Destiny," the first westward surge of settlement reached the Appalachian Mountains. Before the American Revolution, when the colonies gained independence from the British monarchy, the first westward surge of settlement reached the Mississippi River. So the third westward surge of settlement reached the Pacific Ocean. American explorers decided to move to the Pacific West to states such as California, to benefit from the new farmlands and the Gold Fever.

its many islands, high mountains, and remote peninsulas isolated population centers.