Answer:
The correct answer is B. The phrase that best explains the meaning of Manifest Destiny is the expansion of the United States from the Atlantic to the Pacific coasts.
Step-by-step explanation:
The Doctrine of Manifest Destiny was a current of political thought developed in the United States during the first half of the 19th century. This theory defended the idea that the United States was a nation destined to expand throughout the continent, from the Atlantic Ocean up to the Pacific Ocean, with the mission of expanding the civilization of the white man to the other populations of the Americas. This theory was used to encourage American expansionism, promoting the Louisiana Purchase, the acquisition of Florida, the annexation of Texas and the war against Mexico, among others.