Answer:
It was around colonial times. It was coined in the July-August 1845 issue of the U.S. Magazine, and Democratic Review by its editor, John L. O'Sullivan.
Step-by-step explanation:
It was a slogan used by American leaders and politicians during the 1940's, to justify the continental expansion of the U.S. with a revived feeling in Americans, giving them a "mission".
Proponents believed it to be that the expansion was not only good, but was obviously destined through the evidence of two words, "manifest" and "destiny".