How did many Americans justifytheir right to ‘Manifest Destiny’?

The idea known as ‘Manifest Destiny’ changed the course of American history. It justified the United States’westward expansion into areas such as Texas, Oregon, and California. First, how did many Americans justifytheir right to ‘Manifest Destiny’? Second, did the benefits of ‘Manifest Destiny’ outweigh the negativeconsequences, such as war with foreign powers (Mexico, England?) and certainly the displacement anddestruction of Native American culture and society? In your analysis, be sure to distinguish which actions (ex:railroad development, reservations, assimilation efforts) and events had a more significant impact than others.To be complete and factual, your essay must include references/explanations to how some of the followingpeople impacted US history: John L. O’Sullivan, James Polk, John Gast, ‘Red Cloud’, George Custer, SenatorHenry Dawes, Helen Hunt Jackson, Gen. Nelson Miles, Wovoka