How does a person expanding one's space relate to the concept of Manifest Destiny? How about the opening lines from "America the Beautiful" how does it relate to the manifest destiny?

The idea of Manifest Destiny influenced the America’s westward migration because it made that migration more likely. It made America more likely to expand territorially. The idea of Manifest Destiny held that Americans were superior to most other people in a number of ways. They were said to have a superior form of government, a superior culture, and a superior religion. For these reasons, it was said, they were destined by God to expand their territory.