How does this article typify the dominant thinking that led to the spread of the US beyond the Mississippi to the west coast?

The article exemplifies the dominant thinking of Manifest Destiny, which held that it was the divine right and duty of the United States to expand its territory across North America. This ideology justified westward expansion by promoting the belief in American exceptionalism and the superiority of American institutions. It often dismissed the rights and cultures of Indigenous peoples and other nations, portraying expansion as a benevolent mission. This mindset fueled both the territorial acquisition and the aggressive policies that facilitated the U.S. spread beyond the Mississippi to the West Coast.