"Manifest Destiny": Historians Usually Credit John L. O'Sullivan With This Phrase

In 1845, John L. O'Sullivan (1813-1895), editor of the Democratic Review, referred in his magazine to America's "manifest destiny to overspread the continent allotted by Providence for the free development of our yearly multiplying millions."  student moved it to 1839 because of a secondary source.

Because I knew this was wrong, I went searching for where O'Sullivan first used this phrase. Indeed, it was 1845.

But extending my search range to earlier years, I found that he was not the first American to use that phrase, and in that general sense.