What nickname was given to the mid-19th century belief that the U.S. was destined to expand westward?

Manifest Destiny

Who were the female spirits that punished crimes of moral wrongdoing, especially murder against family members? Who was the Greek hero whose strength depended on his uncut hair? In bowling, what is it called when a player bowls three strikes in a row? Which city is the capital of Mongolia? Which legendary city was sought by numerous Spanish explorers believing it held vast riches?