Why was the concept of manifest destiny so influential in nineteenth century america?

United States believing that it’s their right and duty to spread across the North America continent is what we call the Manifest Destiny.  This concept was so influential in the nineteenth century in America because this is the idea which states that it is their God- given right to conquer the lands in the West. It is because of this Manifest Destiny that great happenings in the History of the world took event. Fuel western settlement, Native American removal, and war with Mexico were pushed by this attitude. America was able to do this through treaties, settlements and war. In an article on the annexation of Texas which was published in the July- August 1845 edition of the United States Magazine and Democratic Review, John L. O’Sullivan, who was also the editor, introduced Manifest Destiny.  

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do u have any answer choices man?