It can not be tied to a date, event or even a specific period of time. Manifest Destiny existed and still exists as the philosophy that embraces American history as a whole. Manifest Destiny is an intangible ideology that created American history.
Whether it be freedom of religion, freedom of speech, or simply freedom to pursue one's own dreams, Americans have always idolized the United States as a sort of utopia for individual freedom. “Manifest destiny” is a mindset that embodies this belief. It shows that one way we still show manifest destiny is when we go camping in national parks. This is because we are still showing our efforts to try to conquer or take our large land areas like what we did during manifest destiny.