"Our manifest destiny [is] to overspread the continent allotted by Providence for the free development of our yearly multiplying millions."
This quote is the first time that the phrase "Manifest Destiny" was ever used. John L. O'Sullivan did not come up with the idea of Manifest Destiny, but he gave the idea a name.
Texas has been absorbed into the Union as the inevitable fulfillment of the general law which is rolling our population westward.... It was disintegrated from Mexico in the natural course of events, by a process perfectly legitimate on its own part, blameless on ours....
California will, probably next fall away from...Mexico...The Anglo-Saxon foot is already on its borders.... All this without agency of our government, without responsibility of our people--in the natural flow of events, the spontaneous working of principles....