Mexico because Mexico gave 55 percent of its territory, including parts of present-day Arizona, California, New Mexico, Texas, Colorado, Nevada, and Utah, to the United States
This belief pushed the Native American more westward and more southward. this impacted them negatively because they were pushed off their land. the natives lived on the land before the Americans came.but the Americans went to war with the natives, trying to wipe them out to fulfill their "manifest destiny", and have a nation from sea to sea
B I think hope this helps.
