What do you think John o’sulivan means by “ our manifest destiny to overspread the continent allotted by providence for the free development of our yearly multiplying millions”

Answer:
The term manifest destiny was popularized by columnist John O'Sullivan, who penned an article in 1845 that denounced other nations for “limiting our greatness and checking the fulfillment of our manifest destiny to overspread the continent allotted by Providence for the free development of our yearly multiplying ...